That is a wonderful scheme nostr:npub14hals7mg55wgdj0lwv3p2th0lk5jz9whseagcqkcjamvqqmlf4fsckpqf0 and cemeteries are perfect spaces for it. I read about similar programs in the UK.
Unfortunately, I hardly can imagine any space with a higher fence of red tape than a cementery. Building regulations in Germany are terrible, but cemeteries beat all. That's probably why similar initiative go for street verges and neglected public land.
I need to look into this.
I like, that your approach ticks so many boxes and works on different levels. It's to learn from!