Just some thoughts as I don't know what the answers are.
Firstly, the cultural issues runs deeper than what happens in the ground. I think there are quite a lot of people who enjoy coming to RL games because it is not like trying to enter a high-security prison, so be prepared to lose some fans if we follow the football route. And don't assume banning beer in the ground will make all the difference: a lot of people baulk at the cost of booze in stadia and tank up outside - only so much you can do about that. I can see that a stricter approach might improve the experience at the GF / CC Final, where much of the crowd seems to spend their afternoon on the way to or from the bogs/bar.
As for the players, of course 'Mad Monday' is an embarrassing aberration. Presumably top-flight clubs have rules and regimes over this sort of thing, and if they are broken players get punished. Tbh I find it most annoying when you see players getting excited about Mad Monday on Twitter, when they have had a rubbish season and have already been eliminated. On the other hand, if London stay up on the last day and have a big party to celebrate a fine achievement, why not.