It was a no go 😦
Got the new switches and installed them today. Once again, it looked like the one inside the house worked but the one in the garage was wonky. I didn’t want to spend as much time as I did last Saturday so I gave up and (once again) reinstalled the 3 way switches back.
I’ll have to figure out something along the lines of a programable outside lighting system but for now, the switches work and that’s what I’ll be using.