gg5, prog, luminous, wisdom
知悉	11,232		
知悉し	8,075		
知悉を	123		
知悉が	0

In this case, I don't think a noun gloss is helpful. The other JEs only have 〜する glosses.
I don't think the 精通 x-ref is needed either. Nowadays, we tend not to add synonym x-refs for words like this.

@@ -14,3 +14,4 @@
-<xref type="see" seq="1380100">精通・1</xref>
-<gloss>having complete knowledge (of something)</gloss>
-<gloss>full information</gloss>
+<gloss>having a complete knowledge (of)</gloss>
+<gloss>knowing everything (about)</gloss>
+<gloss>knowing thoroughly</gloss>
+<gloss>being well acquainted (with)</gloss>

GG5: 	complete 「knowledge [information].

I suggest you resist letting the verb usage overwhelm the noun aspect. I don't think both xrefs are needed.

@@ -14,4 +14,3 @@
-<xref type="see" seq="1380100">精通・せいつう・1</xref>
-<xref type="see" seq="2393620">知り尽くす・しりつくす</xref>
-<gloss>having full knowledge (of something)</gloss>
-<gloss>knowing something down to the finest detail</gloss>
+<xref type="see" seq="1380100">精通・1</xref>
+<gloss>having complete knowledge (of something)</gloss>
+<gloss>full information</gloss>

daijisen
https://kotobank.jp/word/知悉-565794#:~:text=ち‐しつ【知悉】,精通。
ち‐しつ【知悉】
〘名〙 ことごとく知っていること。細かい点まで知っていること。精通。
※米欧回覧実記（1877）〈久米邦武〉二「術理より会計の情由まで、一々に知悉せる人なし」

sankoku
知り尽くすこと
詳しく知ること
精通

知悉	11232	  
知悉し	8075	  
知悉して	5571	  
知悉している	2840	  
知悉してい	1625	  
知悉する	1347	  
知悉した	1200	  
知悉していた	1025	  
知悉さ	324	  
知悉しており	314	  
知悉すること	305	  


精通	517292
知り尽くす 34525	 
知悉	11232
精通者	3875

Couldn't figure out how to make "complete knowledge" a verb.

"to know something down to the finest detail" is a direct translation of both the daijisen and daijiten entries, and I think it does a good job making it clear what the nuance of this is vs. similar terms.  "having full knowledge" aligns with the 知り尽くすこと gloss.

n-grams (and definitions) seem to make it clear this is primarily a transitive suru verb.

sankoku, daijisen, and daijiten all give 精通 in the definition or as synonyms. daijsen and sankoku gives 知り尽くすこと. 精通 is vastly (50x) more common than this term, and 知り尽くす is somewhat more common while giving a morphological example of "to X exhaustively".  I think there is some value in linking 悉 and 尽くす.

@@ -14 +14,4 @@
-<gloss>complete knowledge</gloss>
+<xref type="see" seq="1380100">精通・せいつう・1</xref>
+<xref type="see" seq="2393620">知り尽くす・しりつくす</xref>
+<gloss>having full knowledge (of something)</gloss>
+<gloss>knowing something down to the finest detail</gloss>

Meikyo vt and vi additions to n,vs entries
-*- via bulkupd.py -*-

@@ -12,0 +13 @@
+<pos>&vt;</pos>