That’s a hard question for anyone other than Epic directly to answer, to be honest. I’m not sure how they handle marketplace payments, personally.
Though, I don’t see why you wouldn’t be able to have it paid into a different account. I’d assume there’ll be a process for that, where you will be required to send over the necessary details for them to confirm. I can’t imagine you’ll lose earnings. If there’s revenue that has been earned, you are granted your share. However, I cannot confirm that - so please take it with a grain of salt.
Your best bet would likely be to contact Epic’s marketplace support team directly via marketplace-support@unrealengine.com. Sorry to hear about the problems. Hope things pick up in the near future!