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With any automatic firearm, there is an easy way to think about whether it can be forced to operate in semi-auto.
Answer the following question: What happens when you release the trigger with rounds still ready to fire?
If firing stops and the chambered round just stays sitting there, then you can modify the trigger group internals to force this behavior after each round. The sear and hammer hooks work together to catch the hammer even with the trigger depressed and add a trigger reset mechanism which causes a return of the trigger to force the sear to release the hammer only to let the hammer hooks catch it and be set in the ready to fire position.
One trigger pull = one round fired.
This is the Army Training video for the Principles of Operation for the Garand. It shows how the trigger, sear, hammer hooks, and firing pin all coordinate to facilitate semi-automatic fire.
Brother (or sister, IDK), on the catalogues now, and before I found many interesting guns that can be converted to semi-auto only. MP 40s, Russian PPs (and their Yugo clones), Berettas M38/44, MG 42s (and their post-war and Yugo clones), Stens and even a PK. If it technically can shoot once, they will just add a trigger disconnector, and after each pull, it will reset, requiring another pull. Of course, if you’re a naughty boy, you could probably remove the disconnector, but there might be consequences if somebody takes a whiff of it.