Comment by glenjamin

If you want people to adopt your system, you should aim for it to be easier to adopt than whatever their alternatives are.

So I would look into where they're losing time because they need to deal with repeated or inconsistent UI stuff, and make those the priority for the library to deal with first.

If you're forcing work on them for no benefit, then you're not going to get any takeup - so I would also budget plenty of time for the kit-owning team to do a lot of the initial rollout until you can get enough of a critical mass.