Before I say anything else, I just want to say this looks like a very cool mod that was very well thought out and designed. What I'm about to say isn't to say that the party who made the mod and those that have listened to it aren't hearing an improvement and ultimately the only thing that should matter is that your enjoying what your listening to and with that said my thoughts on how something like this relates to Bryton design philosophy.
Our philosophy is as good as it can be while maintaining some resemblance of affordability, that's why a 4B3 is $6800 and not the cost of a new BMW 3 series or more. I can't really speak for the BDP-1 in to much detail, this is when I brought into the company as a consultant and only worked on the software end. What I can say is a mod like this wouldn't be cheap from a labor perspective, it requires removing parts, which is something that can be labor intensive in its own. Then you have the manual wiring from the PCB hosting the power supply and oscillators to the sound card, again labor intensive. You have what would like increase the cost of the unit from its original retail price of $2400 to closer to $3000 in labor along. I don't know how much we could have gotten those oscillators for ten years ago, but suffice to say they alone would have added a good chunk of change to the retail price alone. As for the rest of the parts that make up the power supply, we would have just integrated that into our custom toroidal transformer as another secondary tap plus a few more thing that wouldn't be very expensive. My point so far is we may have added another $1000 to the retail price doing something like this and I know the engineer that put this hardware together is a very intelligent human being and would have measure absolutely everything there would have been to measured and would have came to the conclusion that it wasn't worth the extra cost. I can only further speculate on at least one reason for that, the product was designed to be a digital transport to go with the the BDA-1, the BDA-1 would literally undo any benefit this mod would provide because it reclocks the spdif inputs.
Chris