Hehe I wouldn't sweat it. I should have cropped the page for you since it was the last full paragraph that had the cool part. The old class handbooks all sort of read like that and then throw a table at you somewhere to make it sure it looks sufficiently complex for Advanced D&D lol.

Basically they floated the idea of a druid travelling across far distances via the standing stones.

So using sacred stone formations to travel around like portals. Which is not too terribly disimilar to the waypoints we got in BG3. So maybe the Dwarven monk could periodically return to some kind of fortress of solitude to commune with the rocks and the mountains when using that feature.

I think you've probably already done the hard work here. The current edition is pretty free form, sorta anything goes in that way, and FR is the kitchen sink campaign setting, so whatever goes can go there too. We got the one Dwarf Druid for sure with Nettie and she's has some stone control flavor with her hidden chamber door, so it probably fits. The Dwarven monk part might take some more legwork I suppose, but seems like a pretty workable concept to me.