We accept 50%+ for [uk].

All these stats were given earlier, actually:

ちりばめた	85914	49.2%
散りばめた	88672	50.8% <- kanji wins

ちりばめ	397259	49.6%
散りばめ	403200	50.4% <- kanji wins

Dictionary form is more likely kanji, but dictionary form isn't common.
散りばめる	8731	47.5%
ちりばめる	9668	52.5% <- kana wins

Removed [uk].  What is our official cutoff for [uk] by the way?  

This is very close to a 50/50 split, so probably not controversial to remove here (encountered myself in song lyrics with kanji).

But it now occurs to me that I've been treating it as 50%, and that has always appeared to me to be the practice here.

I've never participated in a discussion on this question, but it seems like [uk] should imply kana-only should be well above 50%.  "Usually" seems quite a bit stronger to me than "more often than not". Or, phrased differently, it seems like if you are highly likely to encounter the kanji form, and if you wouldn't look odd using the kanji form, then [uk] might be misleading.

Incidentally (reading earlier comments), this was also a "star studded sky"-type context.

====

I googled "what percent is usually".  Google returns:
https://grammar.reverso.net/frequency/
always	100 percent of the time (or almost 100%).
usually	about 80 percent of the time.  <----- 80%, seems close to my intuition
often	more than half of the time.
sometimes less than half of the time.
rarely	about 20 percent of the time.
never	at no time.

Whatever our intentions might be, or might have been, it seems reasonable to expect that an average reader who sees "usually kana" on a term is going to expect something in the 80%+ range, not 50.01%+.

@@ -17 +16,0 @@
-<misc>&uk;</misc>

散りばめる is in 中辞典 too.
Meikyo: 表記「散りばめる」と書くのは標準的でない。

Despite being relatively rare, 鏤める is the only kanji form listed in most refs. I only see 散りばめる in daijs

Google N-gram Corpus Counts
╭─ーーーーー─┬─────────┬───────╮
│ 散りばめる │   8,731 │ 45.8% │
│ 鏤める　　 │     669 │  3.5% │
│ ちりばめる │   9,668 │ 50.7% │
├─ーーーーー─┼─────────┼───────┤
│ 散りばめ　 │ 403,200 │ 49.7% │
│ 鏤め　　　 │  11,223 │  1.4% │
│ 散り嵌め　 │      51 │  0.3% │
│ ちりばめ　 │ 397,259 │ 48.9% │
╰─ーーーーー─┴─────────┴───────╯

@@ -8,0 +9 @@
+<ke_inf>&rK;</ke_inf>

@@ -20,2 +20,2 @@
-<gloss>to enchase (a thing) with</gloss>
-<gloss>to mount (gem)</gloss>
+<gloss>to enchase (something) with</gloss>
+<gloss>to mount (gems)</gloss>