Exactly this for me too. Everyone knows the score. If you go in the home stands, don’t be jumping up and celebrating when your team scores. Certainly no colours. And sit on your hands, just enjoy game from a different perspective. Done this loads of times over the years. No dramas. And it’s fine...
When we got thrashed 5-1 at Anfield in the cup, loads of BHA fans in Liverpool stands including me and many wearing colours. Scousers didn’t mind, good day out.
Sorry you had covid, and yes, that would be tremendously satisfying if Chelsea fan bought your ticket. I would be tempted to have a cigar when you’re feeling better!!