I think it could be possible to offer the Xiaomi.eu ROMs without all of the Google apps (just the Play Store, like the Open Gapps Pico package), but since most people also use stuff like the Google App and the Assistant, I think the team has done a good job providing these apps out of the box.
Regarding a completely de-Googled ROM... That's still a job for the custom ROMs available on XDA Developers. I understand your wish, heck I don't like Google either. The issue is that none of the ROMs that I've tried on my Mi 9 Lite can use the cameras properly (apparently it is a limitation made by Xiaomi). At the moment I'm just using the latest MIUI 12 and limiting some of the stuff that Google can take from me, and while I like the look of MIUI, I'm mostly using it for the sake of convenience (banking app, contacts syncing, purchased apps and, of course, the all-mighty WhatsApp that is somewhat mandatory). You can try de-Googleing by removing or disabling certain apps using ADB.