A question for the locksmiths he

Would a locksmith be able to get me started if I somehow lost the RF chipped
key that starts my car? This is a 2002 Chrysler minivan with a device in
the steering column called an "immobilser" (and spelled that way, too) that
will turn the starter but not engage the engine unless the chipped key is
near the steering column. Do they have the tools to re-create that kind of
key on-site or what? I know locksmiths can duplicate the key, but they have
the original to start with.

I want to figure out if it's worth buying and hiding a spare key for inside
the van somewhere (far enough away not to activate the immobilizer).

TIA,

--
Bobby G.