The newest version of the Triumph crankcase bolts were ordered and they arrived. I knew about them and did not use them for a reason. They are poorly designed with a wide and shallow recess for a torx drive. It is possible to install them without stripping the torx openings. They also can be removed if care is used to make sure the torx bit is always perpendicular to the bolt face. Maybe one time. Repeated removal and installation after that is dependent on the alignment of the planets and pure luck.
The work I was doing requires a few assembly-dissassembly cycles. Bolt heads were welded onto the bolts so a hex socket could be used. The bolts are magnetic stainless, either ferritic or martenisic. The bolt heads I welded on are austenetic. It worked. They have not broke off after a few put-together take-apart cycles.