With the present economic outlook, I would go for cheapest % premium recent years (most recognisable, best condition). Chards do a 'Minty' but I've not recently checked prices, maybe go for more specific years if they are not much more expensive.
The 2022s are a decent bet, but lots of people are stocking up on those expecting them to do well - I think it will be one of the highest mintage years personally and not hard to come by.
Look for other recent opportunities that others haven't spotted yet, the ones with privys (e.g. 2017 are selling on the secondary market at a small mark-up at present, I would go for these rather than 2022s, especially if you already have some).
There was no bullion 1989, and the proofs are now prohibitively expensive imho unless you're looking for an expensive purchase that might increase even more (but that's not stacking). 2017 bullion just had a privy - not special reverse - still worth picking up at a low % if you can. 2002, 2005, 2012 - sorry I forget which, but one or two of these may still be picked up for a decent % premium.
I think this is a very good call!