No, you can't. Well..you "can't"
You must operate IFR inside a class A. however, in the real world you can ask to the controller for permission to enter a class A and maybe they are in a good mood and allow you to enter if you have a good reason but the theory is that you can't.
I have in the past entered in a class A as VFR after asking the controller ( we wanted to get above the MSA to do some engine out exercises, etc...) and he cleared us to the new altitude while maintaining VFR.
In my living area, all the skydiving stuff was performed by planes flying VFR well above the class A MSA and finally, after a lot of years, to allow that operation to be conducted inside the rules, the airspace was modified and 2 new class Bravo were created to allow the skydiving activities.