I rarely wear a sporran any more; I find it more of a nuisance than useful.
On a bike, it would make no difference. The wind does not blow the kilt up, as people seem to imagine, rather it keeps the front down between the knees, and I have never felt exposed.
The only thing is to keep the saddle high so that the cloth will not touch the rear wheel.
Yes, it is undoubtedly a woman's bike, but so what? It was cheap!!! The cross-bar on men's bikes may strengthen the frame, but can also be an instrument of torture!
(sorry I did something wrong in posting the pic. Thank you, KCwarrior for finding the right address. It may be because my ISP "wanadoo" has changed its name to "orange".

Martin