I've got some Clarkson autolock type S collets if you need them. The small ones, up to 16mm if I remember correctly.I wouldn’t recommend adapters, they push the tool too far away from the lower bearing, risk of bending the quill shaft, tool, adapter etc if it all goes wrong. 40 int is stronger and easier to change over because it’s beefier and shorter.
I’ll have a look, but I think I may have a spare Clarkson autolock you can have on a long term lend or whatever. Downside on auto locks is you need a range of collets to suit your threaded cutters, but there are plenty on eBay from time to time. Let me know, I’ll drop it down.