Tom,
Maybe you did not understand my question.
Are you looking for a model to run in LTspice, or are you looking for a model to run in XSPICE (or other SPICE programs)?
The ideal op-amp models that come with LTspice have single-ended outputs so they are not what you are looking for -- but my point is that it is an LTspice-unique model making it something that would not run in XSPICE or other SPICE programs.
So -- here it is again -- are you looking for a model that runs in LTspice, or are you looking for a model that runs in XSPICE? If someone made a modification of the LTspice ideal op-amp model with differential outputs, would that satisfy your needs, knowing that it does not play with XSPICE?
Andy