Advice needed for hybrid alarm in new house

[Nishdu]

My new house was pre-wired for a hard wired alarm which I planned to fit myself.  The guy who run the cabling did a good job except he did not wire for contacts on the doors.  There is no chance to wire them now as I cannot run cables thrugh the dry wall panels.

 

My solution I think is something like a Homelink 55

 

I will have 6 PIR, three door contacts, and two RKP's as I have a point upstairs for night setting the system.  Can I add a second 9943 RKP to the Homelink 55 ?

 

The Homelink 55 has 6 wired zones which would cover the PIR's. 

 

I hope I could use wireless contacts for the rest.

 

Prox tags would also be a nice addition.

 

Grateful for any advice.

[Secware_Tech6]

Yes you can do all that