To be honest its been rather a long time since I did mine but.....
I really don't think so. You have live and breath it while you are doing it. Its by far the hardest thing you will have learned to date. And any knock backs cost a fortune. The CPL you should be able to get rid of in two weeks wx depending.
I have heard of folk managing to do the IR part time 3 days a week and returning home to instruct over the weekend. It sort of works but you are physically and mentally knackard doing the IR and I would doud't you would be much use to be honest.
You really need to give the IR your best shot and the only way personally i think you can do it is by committing to the course.
I am sure there will be some current IR instructors come along and give thier views on it.