Critto, I'm very excited by the 6.2 upgrades you described!
I have a suggestion/thought around Minsc if you are going to make him relevant. Why not have an upgrade on his hamster - turn it into a powerful summons - as a personal item for him?
I'm thinking that some of the "lesser" summons (e.g. Joloon/Cerebus/Adamantine berserker warrior) + Manual of elaboration + Crystal from Spellhold kobold fight (can't think of the name) could be used as the components to provide a gated summon with power similar to a greater swanmay or simolidon.
The other way to go would be to upgrade the hamster to make it a party wide buffing item, similar to the improved cat figure but with "mind/spirit enhancing" abilities to the party - such as chaotic commands/remove fear/NPP, maybe chant/bless/mental equilibrium?
I'm personally partial to making Boo a summoning item, though.