No.
The rotary breach is for me the ultimate loading mechanism for fixed barrel guns.
Yes the TP length is elongated as a result but I just cannot abide the idea of putting my fingers into a Guillotine on purpose.
If the the firing cycle is bad then surely basic tuning work (piston weight, guides, preload etc) will sort it out?
And if you did manage to do it, you've made your gun far less valuable / unsellable.