Straight red to anyone that kicks the ball too hard in case it injures somebody. If any two players go for the same header without wearing helmets then each get a red card. Anybody that works too hard could be seen as intentionally producing excess sweat that they could fling at other players as they run past so whoever covers the most ground in a match gets a 3 match ban.
Joking aside, spitting and coughing at other people is scummy and grim regardless of whether there is a pandemic and if the ref misses if then I'm fine with VAR sending people off for that. A bloke up north got jailed for 13 months for spitting at somebody in March so they'll be lucky if they get off with a red.
They need to focus on fixing the current VAR rules and would like to have the VAR team and the ref have mics so we can actually understand some of the decisions.