The HP print head chip itself is all silicon, and should survive acetone.
The surrounding plastic and flex cable – I wouldn’t bet on it.
As acetone is my favorite solvent, and as I have a spare dead cartridge, I’ll stick one in a jar of acetone and see what happens.
Best case scenario: full survivalist.
Good case: flex cable and print head survive, and that will allow us to bond the print head to a milled metal cartridge to hold the acetone.
Worst case: a single bare silicon chip floating in goo.
And speaking of goo – instead of printing with pure acetone, how about printing with an acetone/plastic mix?
That, combined with incrental baking, should cause less wicking of the acetone through the powder bed, and a stronger part.