Remix, zod, tRPC(if/when API endpoints are needed), Typescript, Prisma. This stack is gorgeous. Same language and type definitions front to back is a game changer.
The realtime aspect of what you are looking for is the hard part. The only options I know of are the remix stack above (you still have to do some extra plumbing), elixir/Phoenix (or other turbo links like options but most aren't fast enough). To do realtime updates natively you need to move to evented data front to back and that is a very big move away from models the way we normally think of them. Check out eventide or resolv.js.
Aside from replacing Remix with Next.js, this is also what I would recommend.
Remix makes things that were simple hard (apparently with the goal of doing _everything_ on the server again).
https://github.com/t3-oss/create-t3-app
I hadn't touched much webdev for a few years, the ecosystem / build tooling has gotten a LOT better. It's back to being fun and painless to spin up a new webapp.