https://youtu.be/lK3xdwph7Ms?t=278
Have transponders in all four corners of the car; front and rear wing edges will do I guess (I don't think the device has to be big). Have the teams pay for it, but it will be homologated by the FIA. The teams will have to demonstrate in scrutineering every weekend that the system works as intended.
Last weekend everyone was eager to blame driver [insert the driver you blame here] for the incident. The fact is however, once having chosen to squeeze the 2nd placed driver towards the inside wall, any driver would've caused the incident to occur, in one shape or another. Quite simply because they would've had no way of telling whether a third driver was involved on the far inside, obscured by the car in 2nd place. Maybe playing devil's advocate here a little. Maybe.
Any total cost of such a system over a season would probably have offset - for example the repairs Ferrari would need to perform on their cars. Not to mention the spectacle taking a big hit. Imagine P1 Kimi, P2 Maxstappen, P3 Vettel and P4 Ham after T1. That would've been something. Sure my fav. driver won, but it was dull as fuq. It could've happened in the final race of a title showdown too, and what a flop it would be.