Apparently the Enatic Clan reformed Hellenic Imperatrix of the Gallic Empire can not wage Imperial Reconquest wars potentially due to the "female=no" line in brittania_cb_types
I had two otherwise similarlyqualified generations of female rulers in a row, then a 24 martial son pops in after some bribes and he has access to Imperial reconquest wars from the get-go with only 1k prestige.
For potential reference into a root cause via sequence-of-events in case the line is not responsible--
-All-male line from Soissons unlocked imperial Reconquest in Britain, beeline to get Hellenic Reformation, one of the tenets being Enatic Clans and the other Civilized
-On noticing I could not create the duchy of Segontiacia, googled a bit and found most recent version on Steam workshop was two patches ahead, got it
-Transfer save with seemingly no issues besides potentially having a lot more income than I did prior which may also be chalked up to more feudal taxes and buildings
-spam Imperial reconquest or invasion cbs off cooldown until Imperator dies
-initial female successor does not seem to meet martial/stewardship/ambition requirements, she gets up to speed but does not unlock Imperial Reconquest or Invasion
-second female successor definitely qualifies in Martial, unulock Ambitious trait fairly fast IIRC, still no Imperial Reconquest or Invasion cbs
-pull some strings with a lot of gold, get Son on throne after enacting enatic-cognatic, 14 diplo 24 martial 10 stewardship 23 year old 1k prestige has CBs day one
Loving the mod minor CB weirdness aside
I would probably be careful about going from one version to the next (unless it's only a different minor version), but the inflexible gender requirements will be fixed.
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