I also used copper spacers wire and a lot of solder to make smaller drivers fit in former times…it worked but wasn’t ideal.
There are brass rings for this type of application available, I had some with 20mm to 17mm. In the trustfire A8 there was a 20mm driver.
If there is enough room over the stock driver you also can use the stock driver as a contact board.
There is also a oshpark file somewhere which can be used as adapter if I remember right.
You also could build a 22mm driver with nanjg parts yourself. I dislike the LD25 personally.
This thread
If you want to make it easy this adapter might work
https://oshpark.com/shared_projects/vDNmPf9B
If you can solder drivers you simply could use one of the 22mm driver boards found in the oshpark thread.