Unless every match official is a qualified medic it isn't possible to intervene when injuries occur.
I suspect that, although in principal, the subject matter may have some value, your observations / suggestions are spectacularly impractical
Genuine question, what exactly happened with the electric carts business, was it in any way effective, why wasn't it repeated, and what are your insights into the matter (of electric carts specifically but also more generally on time wasting) as a qualified referee?
In any case, as I've suggested above, quite a lot could be done by enforcing the rules we already have (four steps rule, anyone?), and the matchday experience would gain more from, say, a properly enforced six second rule than "VARs" obsessing over an offside fingernail.