rear rack help for this

planning to make my old SGM charles jerry a commuter for college

ive been reccomended to put a rear rack so that I would sweat less compared to just wearing a back pack

I have a mount on the dropouts, but no hole on top of the seatstay bridge

theres a different rack where I could clamp it to the seatpost and seatstays but there are cables on both sides of the seat stay, dont think that could work

while there is a hole on the bridge, its underneath and only underneath.

any solutions or maybe adaptors that could solve this? or maybe I should just go for a front rack?

thanks

by Loukz