I now know blastcode itself isn't capabel of administrating the rigid bodys it creates under different solvers. This is a fact.

So the only option left is to swap the rigid solver for the rigid body after it has been created. And to do this with maya, either via the hypergraph or the script editor.

But how is this done in a simple way? I don't know, cuz the rigid solver has a lot of connections going out of it. And it's not to happy being disconnected.