Can you get a threaded bb30?
There are some solutions in forms of bottom brackets designed to run 30 mm cranks in a threaded BSA bottom bracket shell. The deciding factor is the spindle length.
Searching the net for &quot;bb30 crankset in bsa frame&quot; gives e.g. this:

Threaded to 30mm Angular Contact BB - Black
Our solution for running a 30mm spindle crankset in a BSA threaded frame.
Notes:
For use with 30mm diameter cranks with a spindle length of at least 104mm. Will not work with standard BB30 cranksets.