Buy gold and Rolexes, hide it and move to Latin America, never ever return to Romania or EU again.
Have some friends or family ship it to you there - if needed, sell some gold, buy crypto and pay them for a flight to take a rolex or two with them.
Paraguay is an option maybe? Try to get a new passport, change your name, etc.
Others, please correct me if what I'm suggesting is totally dumb and not gonna work
it's not like he's already wanted by the Interpol

lol. feels like an overkill. I'd go for an option to reach out to his tax authorities, and ask to settle down the tax debt, then break it down to payments, and pay those taxes for the next 5-10 years. This way he both helps his country budget, and sleeps well. After all, the country budget probably pays his grandma pension, and so on, so forth... no reason to run away like from Interpol....
Not sure why you want to keep that Revolut account and why it seems important. Just withdraw everything and close it, even if it'll report, you can simply spend the next few years travelling or whatever. Can cash out crypto in any country almost, also can easy get residency in many countries with little to no questions, like Montenegro if you register a company only asks your criminal record and passport, that's all (cost 300 Euro) then you extend the residency permit every year, very simple. Can also travel back and forth, no need to stay in the country. Also good option is Thailand, local banks and tax authorities don't care too much about taxing you or asking questions, all they want is that you spend your money here, and not take work places of locals (so the strictest penalties are if you're caught doing a local job that foreigners are not allowed to do, like tour guide etc'. as long as you keep working online, they don't mind, you can declare taxes and pay taxes here properly starting from first year of residency but they won't ask about money you bring into country, they are good with any amount of $$$ entering the economy through foreigners who bring money in). I was not asked about source of funds, when bought a house in Montenegro, and when bought a condo in Thailand, no questions at all, I was surprised a bit, they really don't care where the money came from. And I used Wise.com to pay in both occasions lol, from my American bank accounts. Well, in my case all my money tax is paid properly and earned properly (Bay Area tech startup jobs for the last 4 years...) but still, was never asked even for a bank statement

not during immigration and not during visas applications or opening bank accounts (in both Montenegro or Thailand)... the Thai bank just asks to deposit 500$ for 1 year (locked) and you get a proper account with debit cards. For now my plan is to spend summer in Montenegro, and winters or most of the year in Asia. But paying taxes I pay in USA, so probably starting next year I will pay tax in Thailand, if I stay here long enough. I really like it here. Montenegro is pretty and chill, but boring.