Far too many question marks to work out where your questions are, but I'll try and help answer...
I would say Shutter contact and DT.
I don't fit Honeywell controls as standard. I'd use a Texecom external prox reader for this type of thing. Tag on your garage keys, swipe the tag, open the garage and park up, could do similar on the way out too with correct programming.
I don't really rate apps myself. When it comes to your bike is it the right solution? Think about having to pull up, find your phone in your leathers, take your gloves off, find the app, disarm, put your phone back etc..
I would say separate system would be better for redundancy
This sounds like far too much kit for one panels PSU.
Are you definitely looking to DIY? This seems a large project for a your standard DIYer, lots to learn and trip up on along the way.