That would depend on how wide my mouth could stretch.
Though, I suppose I could try and come up with alternatives.
Well, rather than getting +2 HD for 1 CR, I could take a single class level instead. There aren't many choices, but if I took Fiend of Corruption, then the Alternate Form to turn into any Humanoid form could be replaced with one of my original Brachina form.
Alternately, since this is looking to be an Abyss-oriented campaign, I could base this on a Lilitu instead, and your tentacles could occupy themselves with my tentacles...