Maybe, maybe not. I understand what your saying, and it would definitely take a good die to not deform too much - if it is even possible to not deform too much. But I don't think one can say it won't work, because obviously someone else here has already tried it and it did work.
This is all besides the main point which is to understand the pro's and con's of each approach.
I am not sure if you have seen/heard of them or not, but what got me to thinking about it was the NOE sizing dies. You run the boolit up into them, to a point, then push the boolit back out from the top. It would HAVE to be a very well made die, because I could see it being easy to dis-form the boolit with both the sizing and removing operations. I'll get a picture of exactly how much and where my lands are contacting/being engraved. But here is one that shows it before I started loading to a longer OAL.
I now seat them out further to where the case mouth is a hair lower than the first band. I found that this is the sweet spot for the particular load, but cannot seat out any further without it being near impossible to close the bolt. In fact, its rather hard now.
I just wonder if I took the nose portion down another thou, even a half a thou, if it would make it easier to chamber and move the gas check up a little further.