Can you make us a 5404 and 5403?....
I think that the answer is Yes. We (forum members) can do it.
That is together the brains/knowledge/skills of those on this forum it could be done. I say we go for it. Especially after the news of the X54XX being cancelled changed or whatever you want to call the misshap.
My contribution would be to work and be the leasion with the lamination manfacturer. I would do the work of representing the goup and getting pricing for manfacturing what we need. So far the best choice I know of for this is http://www.protolam.com/
But I would also check out others and shop around for the best price/quality bang for the buck.
Other members here would neeed to figure out the
Magnets (thicker? more poles? less poles? better material? cost of upgrading? and difference in performance)
Winding and pole layout scheme. (more poles/taller/wider/shorter?)
There is really not much more to do to get a product out that we could call our own.
We are probably alot closer and able to do this than we would give ourselfs credit for.