I converted a Senorita that had flown a while as a trike. I ran a separate pushrod to control the tailwheel and countered the extra tail weght by removing the .25 FP and replaceing it with a .40 FP. Heck, if you need noseweight, it might as well be a bigger engine. I also added ailerons at the same time.
What I found interesting was that the bigger engine seemed to be no thirstier than the original .25 was, I suspect because it flew at smaller throttle openings most of the time.