Sverting,
Your ideas sound interesting, but are not well grounded. Try keeping them as you wish but the purpose of this Forum is to help insure the survival of the species. If your fish try to spawn and fail in a large multi species aquarium the term “not a big problem” is indeed a problem.
You yourself are starting with tank raised fish so aren’t you starting with “lazy” fish? You might be confusing “lazy” with “tank adapted” fish or possibly “inbred” fish, which even happens in nature, in small pools and streams to some degree.
The people here on the Forum (many of them) are mostly well experienced breeders and their advice should be heeded for success in breeding.
A biotope enviroment as you you choose to do would be wonderful,but without listening to hose with experience you may be starting over again, through the failures that others have gone thru.
Please, I don’t want to discourage you at all, but also try to listen to those that give you advice on tank setups and spawning do’s and don’ts.
Your desires on keeping them is a noble one and I wish you luck.