I think Sub-6GHz-only would be a good compromise. I'm also assuming they would use the latest processor, as they've always done with the SEs. That would be my dream iPhone tbh.I hope so. Don't forget, it should also have a decent processor like they did with the SE.
• No 5G (although one can turn it off)
• A14 or higher processor (maybe even A13 would suffice)