Hey,
Dunno if your still after ideas but these are what I used to house my Vector mags. only thing is though you'll want to get creative with tie wraps. The buttons on the straps aren't really strong enough to stay buttoned when your running around with the weight of these mags bouncing against your chest, that goes the same for using any molle rig though. tried the pouches on thigh molles too, still need tie wraps
https://www.evike.com/products/44950/
https://www.evike.com/products/53996/