96 Chevy K1500 Clifford RS2 Questions

I have a few questions that maybe someone here can help me with. First I just installed air horns into my truck. Well I would like the horn to blast when the alarm goes off. I have the air horns hooked up to my OEM horn so all I would have to do is connect the factory wiring to the alarm. I wish they would have done that. Another thing is that they did not install the hood pin switch when installing the alarm. I was wondering if I could somehow hook it up to the hood light so I wouldn't have to drill any more holes to mount a pin switch. That way when the hood light lights up it will detect that the hood is open. The last and final question is that I was thinking of getting one of the new 2way alarms. Is there one that will be plug-and-play being that I have the wiring for the RS2 already done. You know, just disconnect the brain and install new brain. Thanks in advance. Will

oh yea it's a 97 not a 96 oops