Just making sure:
Going to use Guest smartapp.
But is there any special special Device Handler for this lock I need to get the most out of it?
You can use the plain stock z-wave device handler or use one of @RBoy enhanced device handlers
You can get the most out of your lock with this device handler, plus you can also use LUM or RLA which gives you even more features than guest locks and can utilize more of your lock features:
Can I add DH after including lock?
Or do I have to remove and include?
I’ve added lock and won’t be back to Vaca home for another 2 weeks?
Yes you can switch device handlers after pairing the lock.