a follower/inverting or non inverting amp is readily possible and easily done. It was my standard configuration for most of my A/D inputs mainly because I could also tailor the frequency response and or make the output uni/bi polar as well. I used LMC662's and one was both follower and gain stage. The LMC662 is a middle of the road +/- 15V - 5V Cmos Op-Amp, inexpensive and good for all but the most demanding uses. I uses several thousand in the early 2000's and perhaps had 4 or 5 fail. I took the liberty of enclosing a data sheet.
There was mention of a CD4067, I've used them and I prefer the ADG408 X 2 to a single CD4067. to use the 2 8 channel devices the enable is the control for the second device and I use a transistor to invert the enable on one device to get a 4 bit address. This works well If you use the 5th bit (16CH enable) as the source for the voltage used to enable either 8 bit device. When the enable pin is high then it can be used to select either 8 bit device and the 4th control bit is the control for the inverter and the first switch. I had somewhat less noise and in production I could choose to make 8 or 16 input channels available. I also included it's data sheet as well as the 4067/97
data sheet.
Bob
LMC662.pdf (481 KB)
DG408_09_a.pdf (230 KB)
CD4097B-mil.pdf (695 KB)