Greetings.
Finally started to read things here after a long gap.
Read what's been said about 25% etc.
Can I suggest that all potentially vulnerable supporters do not return at all until a proper vaccine has been administered?
As such, exclude all senior ticket holders for starters. Add in all who are overweight (me), diabetic, suffering from any other at risk health condition, had lung problems (me), perhaps also long distance travellers (me), etc.
Club then consult all season ticket holders/members/known supporters to find out who is left able to attend (young enough, healthy enough, near enough). And of those, who actually wants to come to games and how often.
It might actually turn out that most or possibly all who could attend and want to attend will be able to be safely accommodated.