Yes, it should.
I do not know the Proboat Westward 18 in detail, but have gained quite some experience on many other sailing models.
I do own a Micro Magic, which rig can be fully tuned to perfection.
The Graupner downhaul for instance can also be bought seperatly.(and could be a good upgrade to the vang on your boat.)
This pic shows one - altough the boom has been mounted upside down.