tacpot, I'm 5'8" and 136 lbs, similar to yourself. I found this was absolutely not a problem when swinging a C85 on a Champ. Yes, sometimes the b*-thing will make you work up a sweat to start it, but thats all part of the fun. Hand-swinging at first can be very daunting, but all I can say is don't do anything quickly, always think about it. I strongly recommend wearing thick glove(s), such as biker's, especially if the prop is metal, as the trailing edge is sharper than wood.
BTW low pilot weight = more baggage / fuel!
PS Pushpak pilots are welcome in the Aeronca UK club as well.