I just dont want to waste my time building a design that is inferior to another
Having built a few tube and transistor regens, I would say that trying a new design is a learning experience. There are so many variables of components, antennas, layout, etc. that it's hard to predict the performance "gains" of a new design. Typically, I end up building each design 2 or more times. The first one is a "breadboard" to get the general concept working, then another with "refinements" (things I learned building the first one).
It seems that you are looking to add an audio stage. I don't think you will see much performance improvement. I have a small audio amp on my bench that I use as a signal tracer. If I hook it to a one-tube breadboard, I have a pretty good idea of what an additional audio stage might buy me.
I guess I would explore adding an RF stage, or going to a pentode instead of a triode and controlling regen with a pot on the screen grid.
Anyhow... it's fun!