You likely already saw it in the other thread that you're discussing this same topic but i'll copy paste.
To take another run at helping you here,
Dissociate the mag from the firearm. The laws do not care what a mag is used in.
Because the MVP is marketed as being designed to use an AR mag, the RCMP will not differentiate between an AR mag that is marked MVP and one that is not, they are still both AR mags. In their eyes it is still simply an AR mag. If you design a mag specifically for the MVP and mark it as such you have simply designed another AR mag. This mag will still be subject to the exact same treatment as any other AR mag.
For the super short and simple version
Mossberg MVP MAG = AR MAG