slave Sanguinolulu repetier firmware needed for extruder expansion (no replies)

I need to add a second Sanguinolulu to Rostock delta to add extra extruders.
Here are my thoughts so far. I really want a repetier firmware solution, but may have to look at alternatives.
1. Email Repetier for help.
2. Appy full Reprap pro Tricolor mendel firmware even though its a rostock delta! To verify i/o link to slave works.
Unless I can find other alternatives I shall try this with dry run.
3. Try to isolate the slave software and turn a mendel into a delta ! or a delta with slave addons.
This is where I lack the programming skills, but if no progress on any front will have learn to write some software.
I will anyway but just a little impatient to get this done now I have thought of it.

If anyone can come up with a comms patch or a few pointers for Rostock varient of Marlin , much appreciated.
Also any other forums discussing this.

I feel alone in trying this, has no one else tried it. I feel a multi feed bowden nozzle is the way forward, although I will accept a working dual as a starting point.

Finally I am going to the TCT show next week and would like to have progressed a little so I can ask sensible questions