Be aware - when you change your root, you'll cause a topology change, at which time all your STP will pause and recalculate. While 45 seconds doesn't sound like very long - it's an eternity to the systems on your network, some of which think .15 seconds (150ms) is a long time.
I caused a topology change accidentally on my "storage" vlan (NAS). SQL servers lost their connection to NAS attached hard drives - and all crashed, which caused front end systems to crash. It was a poor design, that was like that when I got there, and I stepped on a mine in the mine field - so I didn't get fired. But the server team had to spend the rest of the day bringing servers back up. Then they had to do it again, when we fixed spanning tree and it recalculated again.
Make sure to CYA - advise management, in writing, that this is highly risky to the uptime of the network, and make sure you get a change window, with an approved change control (with an OK from the Server Team management). All of course depending on your network and environment.