Downconvert XDCAM to BetaSP question with Kona Lhe.

Ive got a program that I'm laying back to BetaSP.

It's cut in FCP and is in XD and would like to just simply let the board down-convert it.
The program will be letterboxed and I'm wanting just to use the HD colorbars from
the timeline and let the board do the down-conversion to the BetaSP.

What I'm wondering about is possible shifts in color space screwing up the levels
of the bars+program this way causing problems on the broadcast side.

I could create a SD version of the program in FCP and let the software do the down
conversion and then switch the board to SD and layback to tape, but think the board
will do a better job.

In my ideal world I could just use the same timeline HD timeline for both SD and HD
changing only the board.

Any thoughts or feedback would be appreciated.