I envisioned making the crosshead piece out of brass, then soldering the piston rod into a hole drilled in the crosshead. What might be bit difficult is riveting the main rod and linkages to the crosshead.
Nothing about it would be easy but I'm pretty sure it could be done. I would have to see it to figure out the approach. I'm leaning to sneaking up from behind and "working up a #6 on it".
