Stefan
Acquire some 50mm-60mm right angled aluminium 100mm long and 6mm thick and a 100mm vixen dovetail with the 1/4x20 threaded screw.
Drill and tap each flange of the angle to accept the 1/4x20 thread.
Attach vixen flange to outside of one bracket leg and attach PST to inside of other bracket leg.
Mount Vixen dovetail into PST and enjoy Solar viewing
Word of warning - the etalon tuning ring is below the flat basee of the telescope so the bracket cannot protrude further forward than the front end of the black telescope body.
Chris