Have you actually tried that?

I haven't but I have a pretty good idea that that it would feel nothing like
a hard boot setup that included plate bindings.

I used to ride in my ski boots all the time years ago when the only other
options were work boots or Sorels, which didn't exactly give a great response.
May not provide a true feeling of hard booting, but it'll give you a vague idea
of the response. I used soft boot stance angles rather than high ones.