No vendor is going to release a SPICE model of their IO structures because they reveal their internal structure. So IBIS/HSPICE model is the best you ever going to get.
As far as simulation goes, some simulation tools is included into relatively (compared to tools you've mentioned) affordable eCADs like Cadence Orcad Professional or even Standard editions (though the latter is pretty limited because it can't run post-route PCB sims, only pre-route "model" ones). Altium Designer presumably also contains SI simulation tool, but I'm yet to figure out how to use them, and so I use my old license of Orcad Pro whenever I need to run board-level sims.