My 1st full partscaster was a Warmoth Tele (avatar) with a 4 way switch.
I've found I never use the 4th position for the "humbucker" tone. The tone is more akin to the middle position of something like a Les Paul, and it's at a noticeably higher volume than when using the single coils. I've learned, like when using a Les Paul, I'm good with a 3 way switch for N/M/B.
Since that 1st Tele, I've made 2 other Warmoths and working on another project currently. On the other 2 Warmoths, I gave them push pulls for coil splitting and what not. I never use the functionality. Again, I find myself just using the "standard" pickup selections.
As for advice, go for it. It's not hard to do and you may like the tonal options it brings. If you don't like it, it's cheap and easy to use the standard 3 way lever.