Let the entity create another entity.
Save the handle to the created entity in a skill:

you = handle(ent_create(dummy_mdl, nullvector, NULL);
if(you)
{
you.passable = on;
you.invisible = on;
my.skill91 = handle(you);
}

Now you can use the 100 skills of your dummy entity like this:

you = ptr_for_handle(my.skill91);
if(you){you.skill1 = foo;}

Untested, but you should get it.
Dirty hack, but it works like a charm.