I find just the opposite. Of the 2 dozen 19" TV's I've cracked open, only about 6 of them were the 22.5mm necks. The rest were the 29mm necks.
Plus, the G07 has occurred to me as a pretty common monitor among the cabs that have come and gone in my possession, so I just rebuild them, swap tubes, and we're good to go.
I've tube swapped a dozen G07's at this point, and only one required re-convergence, but that's because it had a ton of crt alignment strips on the TV, and I needed to reproduce the same thing on the G07 yoke/TV tube pairing. It came out fine.