I think it can go.

Any point in keeping this entry ? Its meaning is obvious.

Google N-gram Corpus Counts
╭─ーーーーーーーーーーーー─┬───────┬───────╮
│ ミイラ取りがミイラになる │ 5,060 │ 86.4% │
│ 木乃伊取りが木乃伊になる │   161 │  2.8% │ - add, sK (ateji form)
│ ミイラとりがミイラになる │   633 │ 10.8% │
╰─ーーーーーーーーーーーー─┴───────┴───────╯

@@ -5,0 +6,4 @@
+</k_ele>
+<k_ele>
+<keb>木乃伊取りが木乃伊になる</keb>
+<ke_inf>&sK;</ke_inf>

@@ -11,0 +12 @@
+<misc>&id;</misc>

I think it was too long and repetitive. The message is clear with only a few glosses.

@@ -13,3 +13,0 @@
-<gloss g_type="expl">(original sense) going out to fetch someone and not returning (ending up a mummy in the tomb)</gloss>
-<gloss g_type="lit">the mummy hunter himself becomes a mummy</gloss>
-<gloss>the hunter becomes the hunted</gloss>
@@ -18,1 +15,1 @@
-<gloss>the one who bites get bitten instead</gloss>
+<gloss g_type="lit">the mummy hunter himself becomes a mummy</gloss>

広辞苑
(I can read 広辞苑 better now, 5 months on…)

* Add [exp] (explanatory) translations, which *really* clarify things for me.
I heard this used in the “intending to persuade and instead being persuaded oneself” sense (which as per 広辞苑 is the current sense).
The figurative translations are idiomatic in English (indicate a similar reversal), but have completely different meanings (e.g., “going for wool” means “seeking to get rich, but ending up losing money”), unrelated to the *persuasion* sense (I don’t know a good English idiom for this sense).

@@ -12,0 +12,3 @@
+<gloss>intending to persuade someone and instead being persuaded oneself</gloss>
+<gloss g_type="expl">(original sense) going out to fetch someone and not returning (ending up a mummy in the tomb)</gloss>
+<gloss g_type="lit">the mummy hunter himself becomes a mummy</gloss>
@@ -16,1 +19,0 @@
-<gloss g_type="lit">the mummy hunter himself becomes a mummy</gloss>

GG5 sense 1 "〈所有･所属〉 —'s; of; belonging to"

Need to be broader - "'s" is the wrong register in many situations.
I still want to keep this distinct from the everyday の - these kanji forms are real outliers, and are not in most dictionaries.
We still need to resolve the handling of explanatory "meanings".

@@ -17 +17 @@
-<s_inf>possessive particle; 之 used esp. on tombs</s_inf>
+<s_inf>indicates possessive; 之 used esp. on tombs</s_inf>
@@ -18,0 +19,2 @@
+<gloss>of</gloss>
+<gloss>belonging to</gloss>

I get there's a lot of history to this discussion but I think it's only confusing to have this separate from the main の entry with an 
[arch]. I think it'd be better to add these to the kanji field of the other の entry and tag them as oK

Better? "possessive article" just isn't right, that's not what の means, it's what の is.

@@ -16 +15,0 @@
-<xref type="see" seq="1469800">の・1</xref>
@@ -18,2 +17,2 @@
-<s_inf>之 used esp. on tombs, etc.</s_inf>
-<gloss>possessive particle</gloss>
+<s_inf>possessive particle; 之 used esp. on tombs</s_inf>
+<gloss>'s</gloss>

OK.

@@ -6,0 +6,3 @@
+</k_ele>
+<k_ele>
+<keb>之</keb>
@@ -14,0 +17,1 @@
+<s_inf>之 used esp. on tombs, etc.</s_inf>

〈バシバシ／ばしばし〉〈と／撮っ／叩い〉

Google N-gram Corpus Counts
╭─ーーーーーー─┬────────┬───────╮
│ バシバシと　 │ 17,590 │ 83.9% │
│ ばしばしと　 │  3,369 │ 16.1% │
├─ーーーーーー─┼────────┼───────┤
│ バシバシ撮っ │ 11,848 │ 87.2% │
│ ばしばし撮っ │  1,740 │ 12.8% │
├─ーーーーーー─┼────────┼───────┤
│ バシバシ叩い │  6,976 │ 84.9% │
│ ばしばし叩い │  1,239 │ 15.1% │
╰─ーーーーーー─┴────────┴───────╯

Google N-gram Corpus Counts
╭─ーーーー─┬─────────┬───────╮
│ ばしばし │  59,466 │ 20.2% │
│ バシバシ │ 234,547 │ 79.8% │
╰─ーーーー─┴─────────┴───────╯

@@ -3,0 +4,3 @@
+<r_ele>
+<reb>バシバシ</reb>
+</r_ele>

GG5
http://dic.yahoo.co.jp/dsearch?enc=UTF-8&p=ばしばし&dtype=3&dname=2na&stype=0&pagenum=1&index=03449300

This is how I suggest casting it.

@@ -11,1 +11,3 @@
-<gloss>sound of beating or striking</gloss>
+<s_inf>from the sound of beating or striking</s_inf>
+<gloss>violently</gloss>
+<gloss>without holding anything back</gloss>
@@ -17,2 +19,2 @@
-<gloss>firm</gloss>
-<gloss>resolute</gloss>
+<gloss>firmly</gloss>
+<gloss>resolutely</gloss>

http://dic.yahoo.co.jp/dsearch?enc=UTF-8&p=バシバシ&dtype=3&dname=2na&stype=0&pagenum=1&index=03449300

The expression is "のみならず", and is already an entry.

Her sons as well as she were happy.
彼女のみならず彼女の息子達も幸せだった。

Time reveals truth as well as falsehood.
時は虚偽のみならず真実も明らかにする。

Besides mathematics, Nakane had great knowledge of many fields.
数学のみならず、諸学に造詣が深かった。

アームレスチェア	736
アームレスチェアー	181

@@ -7,0 +8,3 @@
+<reb>アームレスチェアー</reb>
+</r_ele>
+<r_ele>
@@ -8,0 +12,3 @@
+</r_ele>
+<r_ele>
+<reb>アームレス・チェアー</reb>

60k hits. Really adding it because the text glossing gets it wrong.