Original iPhone SE is relatively easy to work on, two pentalobe screws and a suction cup will get you into it. It’s not waterproof so there’s no glue seals to warm and melt, it’s still mostly screwed together inside, only the battery has glue strips holding it in.

From there I’ve swapped the battery, moved the logic board and home button to a new chassis, taken the camera module out and tried to clean it, had the screen+top chassis off. It’s not for everyone but it’s not technically complex with many specialist tools, it just needs a battery replacement kit, tiny screwdrivers, workspace, and patience.

Interesting! So I shouldn't expect a similar experience fixing a 13 mini when the time comes?