I'm in a strange position here because morally I'd like the Club to offer refunds. However, I disagree the take-up would be minimal and would expect probably 50% to take up the offer of getting £100+ back. Some will be in real need of it, most won't. That's a big hit to our finances.
More realistically, on a personal level, I'd rather such sums of money stayed in the Club and went towards improving the squad and, if it comes to it, keeping us afloat.
Probably some mechanism where free access was given to games not on the season ticket would have been best - e.g Scottish Cup ties, EL qualifiers etc - but we've no idea if any of those will have crowds in attendance at this stage. That, at least, would spread the 'loss' to the Club over an extended period. Maybe roll the credit over, along with any from season 20/21, and apply discounts to season 21/22 or include formerly non-eligible matches in the season ticket for 21/22?