Bosch/ Fien's Starlock Plus adapter to universal OIS. there is a bit of work that needs to be done but the general concept is that the printed part interfaces with a metal Oscillating saw blade adapter as seen.

Assembly requires:
1x Grade 8 3/8-24 by 1/2" long bolt
1x 3/8-24 Nut
1x Oscillating saw adapter
1x printed part

JB-weld is preferred to bond grade 8 nut to OS adapter