1. Users buy DREIT for HIVE
2. You use HIVE in dCITY
3. Some SIM income will go back to the DREIT holders and some could be used to do token buybacks.

I think this would make a good start.

Without automation it's going to be hard, but only if you will have a lot of people buying these tokens. I think that at the start it should be fine to do it all manually - you can just keep the SIM flowing to the account and only sending it to the holders each week or something, it doesn't have to be every day.

I think you are onto something.
Keep it up.

Do you need help?