Commercial Tank type toilet

The kind with a Sloan valve.

Pipe Rat said:

...... I want to avoid problems as I know how rough these Hoosiers can be even with Sloan flush valves

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If you're really that concerned get concealed Sloan valves.

No tank type toilet will be "durable" because the tank is a ~14" long lever on the tank bolts. All it takes is someone leaning back to break that connection, usually cracking the tank where the bolt holes are. You could install a spacer block behind the tank to prevent this. Then I suppose the next weak point is the lid, so caulk that down.

Or you could use the proven commercial option, a Sloan valve. If it works in a high school it will work in a bar.

Pipe Rat said:

There’s only a 1/2” supply line

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Put an expansion tank in the ceiling with a check on the incoming line.