I'll solve it with PUSH and POP and IE (Enable Interrupts)
If 'it' is modifying the return from an interrupt I guarantee that you have NOT solved 'it'. Your program may very well go to the place you want it to go after an interrupt but you will see a lot of things pop up that you, for a long time, will state are not related to your interrupt return modification. Then, eventually, you will realize that doing things the proven and well trodden way is not necessarily a bad thing and the problems 'not related to interrupt return modification' will mysteariouly disappear..

Erik