Top Down Oblique (45° top-down view) assets in Fantasy Battlemaps

I want to make some 45° top-down view battlemaps. I need the stamps to be 45° top-down view, but I find few this kind of stamps in Fantasy BattleMaps. I can only use the stamps in Fantasy Regional HD. But they are not sufficient to make nice battlemaps like Fantasy BattleMaps stamps do.

There's a workaround in this video:

https://youtu.be/swPOux7o_SY?si=gmuPGwLBiaFSu2qB

But it's hard to use this method to assemble irregular and complicated objects, like plants, rocks. Hope this kind of assets can be added. It's import for SRPG games like Fire Emblem.