Haven't checked in for a while, but since an update was requested I'll oblige.
The injection port on these toys that leads into the foam is only about as big around as your thumb.
(In hindsight, I probably should have plugged that fucker with something... silicone, glues, anything, to seal it up a bit long before it ever got close to water, but too late now.)
Getting enough airflow to actually dry anything out, even with the heat and the descants, didn't seem to be enough. The alcohol probably helped considerably to stave off fungal growth, but it's still a bit "ripe" in there from the standing moisture. (It's still moist in there after all this time, and if I squeeze the toy it it poots out some stank.
I agree with siliconelover, that's probably not healthy. )
Dissecting it as you suggest, beardy, seems to be the next experiment. The way this toy is constructed the bottom and back are just flat bases anyway-- even a hideous surgical scar wouldn't effect the sculpt at all, so I could get quite medieval on it without damaging the integrity of the sculpt or the "love-tunnels."
I'm not sure if I'd want to use the firm expanding foam, though. You can buy A-B kits with the soft expanding polyurethane pretty cheap.