Can't comment if this is ok or not, but I will say we had no trouble getting to these. Do you have a small tungsten bucking bar in your inventory? This guy is work 10x it's price. It has an angle on one side that allows you to get into small spots like this.
I just finished riveting them with no problems with my tungsten bar. Must've been all that Diet Mt. Dew last night that didn't allow me to see the way...?