This gets me back to the introduction of the AVGP Cougars and Grizzlies in the mid 70s. There was a lot of discussion at the time as to whether these were true light vehicles with some warlike/peacekeeping purpose or merely training vehicles in order to prepare both officers and other ranks for duty with 4 CMBG.
The Cougar was obviously not a tank but, more often then not, our exercises were shaped to use them like that. We did use Grizzlies on some peacekeeping missions.
I think that you can use Ersatz tanks and APCs (like cars and pickup trucks) in training, especially the early stages and in areas that aren't proper ranges. The cheaper and non-military the better because you can buy lots and don't get sucked into the idea that they have a real tactical value. Obviously they have zero value as a deterrent. I doubt that any Russian ever considered that Canada would field a division based on 4 CMBG and using either 1 Combat Group or the SSF. We did recreate 1 Cdn Div in those days, but it was limited to 4 CMBG and the M113 tracked components in 5 CMB/CMBG.
Unless you have a proper combined arms force to train for and rotate through you should not waste money on vehicles that are pseudo-tactical like the AVGPs were - especially now-a-days when the primary threat is LSCO. Quite frankly I never agreed with the version of thought for the AVGP and even the LAV as a tool for failed states. Many failed states actors have weapons capable of making short work of those.