I found a used VSIM on ebay for about $100, but I had to wait awhile to find one at that price, seems like most are listed for $200-$300, a new one is around $330. The part number is 68410361AF, that number will work for 2019-22, not sure if you could use one from a 23-24.
The timer i got from amazon, its fully programmable over wifi using your phone. I can look up the settings and will post it later
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Here is the VSIM info, I have highlighted the wires that need to be used, the horn mute is in the brown connector and the door ajar signal is in the grey connector.
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I can go more into detail and post how I wired up the timer if needed, I would have to go out to the truck and look at it since I can't remember exactly how it's wired.