A crazy thought that hit me the other day is that the Bam B26 is a 25mm HW95 cylinder.
The B26 has not been at the top of my list, because the two examples I've played with have had problems with both lockup and pivot bolt.
It would take some work, but probably be quite possible to use a B26 cylinder and piston combined with HW95/98 parts and build a 25mm HW95.
This thread should be renamed ramblings and pipe dreams