Wealth level sharing and other things my party have done

[Great_Moustache]

as far as the Wealthy feat is concerned, you might look at this modification to it:

[Feat] Wealthy Modification

Wealthy Feat, instead of increasing a players actual WL score instead does: Effect Players are able to purchase another item from their WL without having to wait the normal 2 weeks. In addition, they can purchase an item above their WL once every month without reducing their Wealth Level (to represent haggling, shrewd negotiaions, etc). For the purposes of crafting, their Wealth Level score is considered 1 greater. Special If a player chooses this at character creation, for their starting eq…

and with WL, even if the person with a higher WL buys for others, they are limited in what they can buy, especially if it is at their WL, they can only make a purchase like that 1x every 2 weeks default.