Anti theft replay question

[rockyrivermark]

I want to put some type of anti theft my newly restored '70 c10
The hidden kill switch idea seemed to easy for crook to find so I didn't try to hide it.
I have a series of 4 switch that each have 3 positions.
Middle is off. Up is one on and down is another one. They get attached to the plate under the steering column by dash panel and the plate will be bolted with tamper proof bolts.
Then I'll take the long route wiring up my dash pad and down to the appropriate connections. All taped up so you can see the colored wires. Again we are just trying to make it take longer so the thief bails
One switch will be power in and then jump to the next switch for HEI power. The other will be a break in the nueteal safety switch.
Finally getting to my question.
One of the switches will trigger to the horn and headlights.
I want to add a timed replay so it will run the horn for several seconds. If I run a new line to the horn with this relay on line will the horn run on delay when I try to use it at the steering wheel? What type of relay? Example or link ?
Pics below. Basically you will have to know which switch positions are needed to start the truck.
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