Klingerman01 I am really surprised to hear there is a SIM card provider that requires Google Play Services at all. Then those SIM cards wouldn't work in iPhones for example, because iPhones doesn't have anything Google.
I would say, probably any other SIM card provider will work great without requiring any app at all. And they will all have working Wifi calling and SMS. Just order the SIM card, add a subscription plan or account balance to it, and plug it in into your phone, and it should work right away on GrapheneOS.