Possible idea to help open up bot lane to other roles
Basically just make the support items passively give experience over time while also making them not get experience from minion deaths. This would mean that whoever is around them gets the full minion experience, making it possible for mages and such to go down there without losing out on experience.
Of course, the experience generated would need to be lower than the experience from killing the minions to prevent everyone from just taking the item.
The only issue I see with this is that it will be a strict buff for adcs down bot (since they'd get more experience than they used to), but if other classes go down there, maybe that would balance out.
This idea just popped into my mind and I am rather behind on sleep, so it may be a stupid idea. If it is a stupid idea though, I'd be happy to read about why so I can do better in the future.