EHBA 2018 rules can be downloaded here:
https://poloverse.net/uploads/short-url/81WPvolbO7rUoMOc55xGfWVmIfL.pdf
I would give section 7 and 8 a good read. Penalty escalation depending on the situation, the severity of the infraction and the personal fouls are already in place to assess time penalties where a player has to sit out.
For example, when a foul is committed on a scoring opportunity it is an automatic escalation by one degree, plus a personal foul that can lead to further escalation. Referees need to be more strict on giving 30s for fouls on scoring opportunities. It is often forgotten about.
This is not entirely clear to many players, but the advantage while in ball possession is nothing but a bonus. It is NOT the consequence of an infraction. The personal foul procedure is the main consequence.