Before i start i would like to say i know the point of how the shop is handled for ironman is to prevent easily gathering the best equipment for yourself. I would like to donate more as an ironman but dont see much incentive as getting my money worth. I was going to suggest maybe adding a Brawling Gloves as an extra XP boost of maybe 5-10% when skilling ANYWHERE and not only wildy. This would be helpful for all modes and not give any item advantage and will encourage more spending on ironman accounts.
Edit: Maybe make them untradable aswell to not ruin the economy?