Customer service at Zektor gave as much help as they could while being unfamiliar with B&O. The older model of Zektor box (indicated with just a "4" and not "4.1" or "4.2", I believe) has a default control setting that the Beosystem 1 automatically controls. The newer boxes (4.1 and 4.2) will still work perfectly. You just have to "teach" them the B&O codes. It's actually quite simple, and Zektor will be very helpful with this.
It's possible that you might need to connect the Sony BD player to another tv in order to make the settings for 1080i. I'm not sure about your particular model. I had to do this with my Sony PS3 because the PS3 would send out a default 480i signal. The Beosystem 1 MUST receive either a 480p or 1080i signal when using the component input. It WILL NOT recognize a 480i or 720p signal at all. With my Sony PS3, I had to connect it directly to a non-B&O LCD to make the appropriate signal settings before connecting it to the Beosystem 1. You might try also connecting the s-video of the BD player to the Beosystem 1 until you set the signal output.
I find the signal from a BD or HD DVD player to be as good if not better than a digital HD cable box. Without starting any discussion about a format war (please! I have both) I would recommend an HD DVD player over a BD player simply because the price is much, much lower. At $99, an HD DVD player is as cheap as a DVD that upconverts. If you're uncertain about the purchase, an HD DVD player is much less of an investment. After you see the difference, you'll probably want BOTH formats. lol
P.S. If you tell me the make and model of your BD player, I'll be happy to look through the supported devices on my Beosystem 1 to see if the 4.7j update includes control of it.