You are welcome to try and report the results
Why would I attempt to do something that we all know can be done? Austria can annex people, and they can release them as vassals to lower legitimacy, just as Bohemia can. You're making the claim that Bohemia being emperor allows them to annex one and two provinces minors faster than Austria can. Prove to me that having more than Austria's 30,000 troops (which you can just go over if you mint, as you should if you're going for a record), will make any more of a difference when the armies you're facing are comprised of 2,000 troops, and I will concede you are right, otherwise I don't see why being HRE would make any difference.