Hmmm, things are getting complicate... I'd suggest you to take the model anyway and make your experiments. If there is a chance of using the model from lucasarts game in "our" SH4 without problems then send a letter and ask for permission. In fact is the RELEASE of your mod containing their model that might cause violation. If you test the procedure (extraction, conversion, insertion in sh4 and test) without publishing the mod, no problem
. Since it may not work properly, i think it's better not to waste time on asking for rights that may prove to be of no use.