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I never thought it would have a Chakra upkeep, because as you said it's a biological transformation. Same as there's no reason to think Orochimaru's True Form would require a Chakra upkeep. It's him. I have nothing to prove Summoning Jutsu is involved, but I personally think it is as that's the only way I can explain the severed heads proofing away like Kuchiyoses.
I'm skeptical in how that'd turn out.
Except the true form is him, this is a literal transformation. They aren't the same, one is more natural for orochimaru than the other. They disappeared because they were made entirely of chakra, and without chakra to maintain them, they vanish. Like most other ninjutsu.
Here, it's like saying Kakuzu using his threads to enter the final form he revealed against Naruto is free from chakra manipulation. It's natural for him to have these threads, these hearts. But the action of moving them like that requires chakra to keep the form up.