Adding more depth to Yuumi's passive?

I was thinking about a possible adjustment to Yuumi's passive "bop n block." Currently every few seconds she can auto enemies to get a shield, this shield can then be transferred to an ally she attaches to. I think it would be interesting if instead of simply having her transfer the shield she gets from bop n block, she instead transferred ANY shield she gets to her attached ally. Currently the most popular secondary runes on Yuumi are presence of mind and cut down, I've asked around a bit about why presence of mind in particular is so popular and people simply respond that it's "the best option" not particularly amazing on Yuumi, just out of their given options there aren't any that are "better." If Yuumi had the ability to transfer shields to her allies other than her base passive shield then instead of presence of mind that would open up the choice to instead take "Overheal" and Yuumi could transfer that shield as well. In addition to this Yuumi players would also have the option of taking barrier as one of their summoner spells, currently barrier would be useless to a Yuumi, but with this change to her passive she could use it protectively for the ally she's attached to. I know riot won't see or care about this post but I'd like to hear your thoughts anyway. Do you think this change would be good, or would it be way too op?