I doubt this, but the Mars FPGA project supposedly will have a Dreamcast core and it’s being supported by respectable people in the community. The mister cores for everything else could be ported, though without the support of the original developers that might be a bit sketch.
I still doubt it, but I don’t think it’s impossible
They might be able to do what Taki did and source the components they’re looking for directly from the manufacturer rather than using existing boards.
I do think this is a big stretch, but things in this market are starting to change.