Hi Robert,it might as they would be a specialty item.
I'm no technician but taking half of a 3b-sst or 4B-sst and making it into a mono block(which I believe both have total separate power supplies),
I imagine making a smaller chassis and the extra messing about with the electronic side of things might make her a bit more money,maybe,maybe not.
Not every body has space for separate amps,especially fullsize mono blocks as
they will go with a 2,3,4 or 14 for what space will allow or that they like 2channel,which we need for stereo.
It would be a specialty item for sure,wish I could take a pict of a Bryston amp
and compress the width of her 19" down to 10-12" and add maybe an inch of height and shorten the depth.
They would work well in small rooms(I have one)they would like superb and with one channel of a 3Bsst or 4bsst you definately wouldn't be hurting for
power all in a compact package.
Robert can you visualize your 4B-sst2 half the width,an inch higher and maybe 6" shorter(WITH HANDLES).Quite visually appealing I think.
Besides having enough power they would be very attractive and I bet your wife would like a couple as mine would also and they can lift them

.