Bob,
For the first time, I think, I have used a non-springer rifle
I cannot see why the HW30S could not be fitted into another stock - all that would be needed would be some semi-circular spacer pieces fitted into the new stock, front and rear, and a block to allow the front mount to work.
For a very cruel solution, the action could be glued in place - like my Diana 35 !!!
Food for thought and experiment
Have fun & a good Sunday
Best regards
Russ