Send Off equivalent to Injury roll

[Joemanji]

I'd be very wary of that, unless you combined it with weakening the effectiveness of fouls. Basically you are making 50%+ of foulers come back into the game

It's true this is a big swing. There might be a requirement to tweak elsewhere. But whatever happens the player still leaves the pitch. So it is an in-drive disadvantage.

Looking at some quick numbers (all against effective AV5).

P(no effect) = 28%
P(Stunned) = 42%
P(KO) = 18%
P(CAS) = 12%

P(sent off under current rules) = 27%

P(fouler sent to Reserves) = 16%
P(fouler KO'd) = 7%
P(fouler BH) = 4%

Which on consideration does swing things heavily in the favour of the fouling player. Not my intention.

Perhaps as an alternative all sendings off could result in an automatic KO?