Being unfamiliar with the A330 BE seats I decided to go through DTW and get the 767 flat bed seats.
Calling premium services didn't help much although had a nice conversation with the last agent. He stated that the fare class I was booked in wasn't available anymore and thus couldn't help me. Didn't want to escalate to a supervisor and already had the offer of a fellow FTer to help, so choose that avenue.
Got the routing I wanted and a couple of extra miles along the way.

Thanks for all the advice provided. It's great to be part of such a knowledgeable community.