To be honest if you "Arent getting into it too big" and just plan to shoot local shoots and THEN switch over before hunting season then don't bother with a completely different set up. Just use your hunting bow set up and transition right into hunting season....and focus all your energy on making good shots and learning yardage. Doing it the way you describe is more of a headache than anything.

There are 3 types of 3D shooting :
1. In it to win it
2. For fun
3. Practice for hunting

1. Demands a dedicated set up and some serious practice with stuff you wouldn't necessarily use hunting.........2 and 3 don't.

Take my advice from an "In it to win it" guy........if your IN your IN........if your out, your in 21st place.

But if you must, I will send you a little 3D pin class tutorial I typed up for a guy last year. Its on a different computer so it will have to wait til' I can get it off to you tomorrow.