You could grind down a normal 1/4" bit holder to fit the Leatherman bit driver Several members have done it and I'm sure you will find pictures if you search in tje mod squad section Sent fra min FRD-L09 via Tapatalk
I think for an st300 compatible kit you’ll get the wee jobbie that fits over the 3D phillips bit that then takes screw driver bits.The good thing about leatherman bits over hex bits is they are double ended and weight saving. And work remarkably well. I have put a lot of miles on leatherman bits and they last well. Unless you are a ham fisted oaf of course.