The MOLLE can be hidden behind a regular kilt belt or even a GI type pistol belt. The keepers you see in the pic are completely removable and can be placed anywhere along the MOLLE if their placement interferes with gear.
If paintballing is the intended use, I suggest a removable rig for that can be worn over the small of the back, but you can find (or I can modify) existing tube holders that use MOLLE or PALS webbing, if you wanna attach them directly. The rest of you tools, rags, plugs, etc can either go in the cargo pockets.