you can't install BES without a key so unless you have their migration package you'll have to install BES the day you do a cutover.. knife-edge as RIM calls it.
I did exactly what you described, moving BES to a new server and migrating from MSDE -> SQL (which is also on a diffferent server) all at once..
The entire process only took about 1hr, I followed all the documentation provided by RIM and didn't run into any issues.
One thing to keep in mind is that because your servername is changing you'll need to make modifications to the SQL database.
It's been a long time since I did this but if you search for my post from awhile back there was a lot of good info provided by the other posters. I believe I also made a final post which summarized what I had to do.
Good luck, and don't worry, it's EASY!
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