I see quite a few submersibles. The pump part attaches to the motor with four stainless steel bolts. They usually come apart easily enough. The old pump sections had a fair amount of brass in them but i don't see them very often. The new pump sections have gone to stainless steel now. It's quality stainless.
The motors would be hard to do. I've only attempted one. The windings were encased in a white waxy / plasticy substance to waterproof the whole works. My guess would be that it's loaded with PFAS to enhance the waterproofing. Franklin Electric always used to be the standard motor brand you would see. That's the kind i dismantled. They seem to have gone to ITT nowadays. Those ones don't hold up as well as the old Franklins.
Anyhow ... i think i would recommend the upper pump sections of the submersibles as being the better chance for some scrap value.
Later edited to add:
I found a youtube on scrapping the submersible pump motors.
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