Having played ultimate ironman a fair bit here on Alora, I'll have to disagree with your suggestion.
While I agree that buying back void and stuff is annoying and expensive. But as the others have said, once POH is developed a bit more and we get the option to store a bit more items, not only void but we would also be able to collect cosmetics because of the given option to store them better. But since this really only impacts the ultimate ironman gamemode and we are few I don't think we will see a whole lot of love in terms of QoL-updates towards our gamemode.
Having to suicide to retrieve items from the looting bag is such a big part of ultimate ironman and I would hate to see it being removed. Yes It's annoying, but the gamemode is annoying and thats the challenge and the main reason I and many others like it so much.
The hardest part about playing ultimate ironman is planning ahead. If you have a solid plan to follow, or at least follow it most of the time you shouldn't run into issues where you have to buy back void 3-4 times a day and bankrupt yourself.
More of like a suggestion to your gameplan, just get armadyl asap. The drop rate is good and it doesn't require much skill or gear to obtain it.