'Manager' is not descriptive or unique enough.

[MaxHasADHD]

I think 'Manager' is too vague, not a huge issue but 'CallbackManager' or something would be more helpful.

[phimage]

I think you are right. Could be boring with import.
There is no syntax import class CallbackURLKit.Manager as CallbackManager

For others projects when I have some collision I put in one specific file, and sometimes it do the job

import CallbackURLKit
typealias CallbackManager = Manager