What KSP really should have done is just done their orbital math separately from their force propagation. If they had made a virtual node for each craft's cent

What KSP really should have done is just done their orbital math separately from their force propagation. If they had made a virtual node for each craft's center of mass, they could have made it so that the COM position was just never affected by intra-body forces and done the orbital math in super high (Float128?) precision.