Sounds like you know what you are doing.
We don't bother with wbv no matter what (except for trauma which we've had none so far).
My grandson had his last vaccine at age 15 mo. and that was the last time he saw a ped. He is 10 yo now.
My other two grandchildren ages 2 and 4 completely vax free, saw a ped maybe three times and that was because the ped is a friend of the dad and dd did it to be nice.
Why should you take the child in to see a ped when there is nothing wrong with him? Don't bother wasting your time. Kids don't need to be in dirty doctor's offices or hospitals. Those are some of the dirtiest places around.
If you are worried about measles (although we are hoping our grandkids will all get them), have some CLO handy, you might even give it to him every day, and have some SA ready just in case.
But learn about the benefits of measles and it might not scare you quite so much. I had them and so did every one in my generation. I didn't know one single kid in my school that died. Not in my entire life did I know anyone who died of measles. The scare mongering is ridiculous!