However 見窄らしい is the form that's in the Ichiman reference list. I think it can be dropped from the kanji.

@@ -6 +5,0 @@
-<ke_pri>ichi2</ke_pri>

I don't think it really makes sense to tag a rK form with any prio tag.

@@ -5,0 +6 @@
+<ke_pri>ichi2</ke_pri>
@@ -10 +10,0 @@
-<ke_pri>ichi2</ke_pri>

OK. I think "seedy" is OK - it fits the other glosses. Maybe danger/illegality is an AmE nuance.

@@ -10 +10 @@
-<ke_pri>ichi1</ke_pri>
+<ke_pri>ichi2</ke_pri>
@@ -14 +14 @@
-<re_pri>ichi1</re_pri>
+<re_pri>ichi2</re_pri>
@@ -21,0 +22 @@
+<gloss>seedy</gloss>

Google N-gram Corpus Counts
| 見窄らしい　 |  1,629 |  2.6% |
| 見すぼらしい |  1,316 |  2.1% |
| みすぼらしい | 59,009 | 95.2% |
|-ーーーーーー-+--------+-------|
| 見窄らしく　 |    533 |  2.4% |
| 見すぼらしく |    532 |  2.4% |
| みすぼらしく | 20,767 | 95.1% |

To me, "seedy" has connotations of danger and possibly illegality. The
gloss in GG5 but I'm not a fan. As I understand it, the meaning of
みすぼらしい is more narrowly focused on physical appearance.

The kanji 見 appears in ~5% of usages, so I don't think 見すぼらしい
technically counts as [rK]. I think it's safe to move it to the
first position.

Should this be demoted to [ichi2]?

@@ -5,2 +5 @@
-<keb>見窄らしい</keb>
-<ke_pri>ichi1</ke_pri>
+<keb>見すぼらしい</keb>
@@ -9 +8,3 @@
-<keb>見すぼらしい</keb>
+<keb>見窄らしい</keb>
+<ke_inf>&rK;</ke_inf>
+<ke_pri>ichi1</ke_pri>
@@ -19 +20,2 @@
-<gloss>seedy</gloss>
+<gloss>unsightly</gloss>
+<gloss>unkempt</gloss>