Thank you guys, really amazing.
And I know what my options are now, basically the only alternative is a crypto debit card which works on the Visa/MC system, with additional fees and often no access to private keys for the crypto coins.

So buwaytress is probably right, it's simpler to convert the FIAT into crypto for the time being, and pay with crypto directly, whenever and whereever it is possible.
Otherwise I will end up paying unncessary fees for convertion. I think we are not that far away from a greater number of crypto-friendly services, recently booking.com added crypto payments (although I haven't discovered it on their website yet, but articles were there), so others should follow soon.

We are the Revolution!
Merry Christmas by the way to all of you!