telero, the prototype forward charging handle I made works very well and is a slip on so there is no modification to the rifle except a small hole drilled into the charging handle catch. It still works as a rear charging handle at the same time also.
The internal version for the Bullpup will be ambidextrous and will mostly be built into the Bullpup. The design is still in my head and am trying to figure out how to make it work for both so its still in the design phase.