I know that both of the daycare centres DD has been to don't take non-vacced kids. (We didn't choose them for that reason, it was just coincidental)

The 12 month one IS hard to watch, and DD get get terribly bruised...but it's over so fast...thankfully, the 18 month one is literally just one needle. Compared to the 12 month one, it was a breeze!

I see no reason why you couldn't break up the 12 month one into two or three lots.