PLATINUMEDGE Deburring External Chamfer Tool with 3 Tungsten Carbide Blades,Quick Release 1/4" Hex Shank, Fits 1/8"-3/4" (3-19mm) – Repair Damaged Bolts, Screws, Threaded Rods & Pipe

Yeah I think you want something like the opposite of a countersink tool, call it an external deburring tool... Like this https://a.co/d/00KWabWi Not sure how deep the cups are on these and they may not fit every cutoff end if the cup is too deep but it looks like the right kind of idea.

There is a chamfer tool meant for bolts after cutting. That may work. https://a.co/d/06RUtNRB Cordless grinder would be my bet.