Never going to happen, ever!
Apple will not allow the use of their over 10-year old wireless mice and trackpads when they have a much newer versions of these input devices that are still compatible with many of their latest computer and computing hardware.
Sorry, but that’s the reality.
If anyone in this posting think/feels they can change Apple’s thinking on this issue,
Everyone who posts here is free and welcome to submit feedback about this issue to Apple.
This is only one of the few ways to directly contact Apple about ANY product issues.
iPad Feedback
http://www.apple.com/feedback/ipad.html
Cognizant Apple employees read ALL feedback generated from all of the various feedback pages and transfers the data to the proper and responsible Apple teams and personnel, but NO Apple employees will ever respond with any type of direct, individual replies from the feedback you post.
The more users that post product feedback about any product issue, the faster Apple, in California, is made aware and starts working on a fix/solution for a future software update.
If no one posts feedback to Apple, Apple will have NO clue that there are any types of issues with their hardware or software products!
Good Luck to All!