1K PAR64... I'm not aware of anything.
However, if you can settle for lower output, I was pretty impressed with Verbatim's small selection, price, and dimming with standard dimmers. IIRC, under $100 per lamp...
There are almost certainly better solutions before pursuing this one, but I thought it worth a mention.
I'm not aware of a 1-10V to 0-10V conversion device with integral relay, but there are such DALI to 0-10V devices...