Hello!
If it is like You say, will it not destroy the leather? After all glycerin is absorbing water, and alchochol is mixing with water and evaporating... so after everything we have leather which is dry and soak with glycerin - which without water will dry hide even more. And if it is a mixture for stretching it's not good for renovation the leather.
Hope my english was good anough to understand
Gunter: when I'm trying to restore some old skins, the most important thing is to soak it with water, than apply some fat/oil to keep it inside . You can also use such thing as a mix of glycerin or lanoline with water (both you should buy in a pharmacy). As I never make anything with snake skin, I would try to restore only a small part of it at the beggining.
Edit: or you can use leather conditioner that you can buy in leather/equerstian shop . Usually this is compound of water, wax, lanoline, glycerine and some oils. Still check how the snake is react on it
Hope it helped,
Karol