It's possible to be almost self sustaining, but it won't be easy. The lack of maintenance will likely result in buildup of mulm and detritus along the tank bottom. This will not really be detrimental but it won't look very good either.
The big problem, though, is figuring out how to keep a substantial sized shrimp colony capable of keeping the fish well fed. They aren't going to police themselves. Maybe a tank divider with a mesh size that only allows small juvies into the fish area. Having tons of plants in the tank isn't going to be enough to keep them from wiping out the colony.
One other thing that will help is to have less predators in the system. I'd reduce the number of otos also, but they are a good choice for a low maintenance tank since they are fine with algae and biofilm.
You didn't put any of your * 100% non negotiable stars next to the stock so I don't know which ones are mandatory.
You don't have to run both an airstone and a filter. Either one would work, and if the tank is well planted enough you could probably get by without any filtration. Having some surface movement is a good idea though because the water will get a film on it and you could have issues resulting from it.
I would Just keep the filter going and ditch the airstone because it'll help clean some of the particulate that is bound to accumulate.
As far as plants go, the various hygro species all grow quickly and large enough to help reduce nitrogenous waste.
Other potential problems would be if the shrimp population stops reproducing. This happens seemingly randomly with shrimp at times and could be attributed to a number of things like seasonal changes, or a buildup of something toxic enough to cause them stress. The other thing that could be an issue for them is with the lack of water changes your GH
and subsequently pH will drop really low. That's not much of an issue when ammonia/nitrate is involved because the plants will still deal with them, and ammonia in a low pH tank is not very harmful in modest amounts anyhow. A potential problem could be the shrimp not having enough Ca
to molt properly, and if nothing new is coming in the system then this may pose a problem at some point.
Another good stocking plan would be something like a few dwarf puffers and some small pest snail species, but again I would try to devise a way to keep them separated at least somewhat to keep the population in check.