Despite we are supporting eXch's manifesto, as a small business we do not have any other alternative than using big payment processors due to nature of the business. If you have any suggestion of payment gateway that doesn't check KYC/AML and provides great liquidity for conversion, feel free to share.
I understand it looks easy to host own payment gateway, but if you are a small business sadly that's not doable (not because of costs, but because of liquidity needs).
I think your current provider cryptomus is accepting XMR monero for payments and purchasing cards, that is a good way for anyone to make AML checks obsolete.
As for another payment processors I know about AnonPay that is made by Trocador.app, and they accept over 800 cryptos.
There is always option of using self-hosted BTCPayServer for accepting Bitcoin payments with 0% fees.