If you don't want to wait for answers, a similar question was posed in 2019 and you can read those responses. I believe you will not find any competent person agreeing to remove rim material. WARNING: Tricks may appear in the following thread.
https://www.bikeforums.net/bicycle-m...-diameter.html
And there have been bad tire rim combinations going back decades; way before tubeless.
My only suggestion, while not a trick, is to first see if you can mount the same tire from another bike that you have ridden for a while. It may still not work. But I have found that after a tire has been mounted and ridden for a while it does become easier to remove/mount. I imagine some will disagree, but stuffing a 2.1 WTB Velociraptor into a sub 14mm wide Matrix Mt Titan rim has taught me differently.
John