One thing I'm wondering, before he fled to the Embassy, he was out on bail, for which supporters of his put up their property for. Given that he skipped bail they would have forfeited that property, now that he's arrested again do they get it back?
The supporters who put money and assets forward where doing it to show their faith that Assange was not a flight risk. This has been proven to be false.
In other words, if he did surrender according to terms, the money would have gone back to Assange who would have returned it to the donors himself.
I am not sure the donors have any legal way to get the money back now. Unless there were agreements Assange signed, all that money was basically gifts.