I believe one of the things you'd want to do would be to move the main gear back a bit.
That would entail building a suitable structure to support them.
My Alpha 40 trainer has tricycle gear, and the main gear is just behind the C/G point...couple of inches anyway.
If the main and nose gear are too close, the steering would be quite squirrelly (sp?)!
Then, would you want steerable nose gear?
I'm sure others will chime in with more thoughts.