MPEG2 HD for Broadcast?

I need to output HD commercials to a TV station using their requirements:

Video:

I assume transport (not specified by the station)

4:2:2@HL

16x9 (1920x1080)

45 Mbps

Audio:

MPEG or PCM audio

2 channels

384 Kbps

48KHz

I've been using Episode, because it's easy to set all this up, but I thought I'd see if it could be done in Compressor. So far, no joy. Bit rate in CBR is limited to 40, and I can't tweak the bit rate on the audio at all. The station might take it at 40 Mbps, but anytime they refuse a spot they alert my client, and that's bad mojo - permanent record, black marks, and all that.

Any suggestions?