Are the 0-4-0 wheels the same size as the consolidation ,mikado and mallet? If they are and it is a new profile then this could be interesting. It would also need new gear boxes or at least new axles to convert the consolidation. But,kind of getting the cart before the horse in my thinking. Maybe someone will post a closeup of the wheels.
Apparently the "spare parts" to retrofit existing steam locos are not available yet, "under development"... at least a positive sign... was pretty dubious that the spare parts would be here before a steam loco was outfitted with them.
What is still to be seen is if the 0-4-0's actually have this different axle and wheel.
Hopefully in a few days someone will take a wheel off and take pictures.