I've had a tab open with Kamameshi's twitter, just to look for signs and potential developments in the relationship with Nijisanji and Elira. For the longest while there was nothing and the Doki announcement just sort of hung out right below a banner and pinned tweet containing Selen and Elira being best buddies for life.
But now something finally changed. The pinned tweet was changed, removing... Selen. The banner is still the same with Selen in there but the pinned tweet, which I don't think had been changed since January, is now a solo piece of Elira.
So I think Kamameshi wants to stay as Elira's mama and potentially work with Niji in the future. As for Niji's side, I think looking at the impulsive discissions they've made before, had they had a problem with it we'd know by now.
Pinned tweet before (embed won't work):
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Pinned tweet after:
The banner art:
View attachment 72846