Secondarily, find a lawyer to write up a contract for $80/hr for companies to sign and have him do work on core-js when they need an update or a feature. He can give an estimate on hours, send them a contract, get it signed and have the work done. If the people asking for feature requests and updates don't want to pay, then that's fine, it doesn't need to get done.
I wonder if external banking is possible: a Russian goes to a supermarket in Russia, he buys food, he pays by transferring money from his e.g. Swiss bank account to the supermarket owner's Swiss bank account. The supermarket owner wins because s/he basically managed to trade local goods for foreign currency (the Ruble is on shaky ground), the customer wins because he gets to eat.
I think I remember paying for a hotel in Russia using PayPal but transferring the money to a German bank account of the hotel owner's cousin or something...
People who can afford it literally travel to Belarus\Kazakhstan for a weekend just to get a debit card that works worldwide.