Yes, and I’ve talked with Mullvad about it before. The main problem for us is that we cannot exchange XMR for fiat legally, in Portugal, and we have no costs that can be paid with XMR, at the moment.
ProxyStore should work well as a proxy because they receive XMR anonymously and pay us in EUR for an account number. We don’t know who paid for what and don’t care (we also don’t know that after 14 days, Mollie doesn’t know any account number).