Or so I've heard.
What we need is for these pills to be compounded the way they do opioids: the wax granules are arranged to attempt to keep you from getting a burst dose by crushing the pills. The same process that makes crushing work makes splitting not work. So if you make split pills still time release, no problem.
But not for saving pills. Some people are exquisitely sensitive to these medications and you need 25mg per day but it only comes in multiples of 10 up to 50. So you’d like to split a 50 and take 1/2 pill per day. Also the 40mg often costs only 30-40% more than the 20.
Hard focus work could make it work shorter, but also some have metabolism so quick that they burn through medication. That's controlled by doctors so no worries, but I know people who take IR forms every 2 hours, and for those XR forms don't work at all (as it's like 2 complete cycles with all side effects).
you can simply measure the grains with a scale and separate some fraction.