I am 6'3" and have to bend a bit to look through the viewfinder. I don't find is too much of a problem right now - it may get worse as I progress through my "golden" years - I am going on 63.
The camera is going to have about 3" from the base up to the viewfinder, and the head will add probably at least another 3" to 4", so that adds to 6" to 7" and removing that from your 75", brings the top of the tripod down to the 69" area. It all boils down to what you think your personal preference is going to be in using it (and the ding to the checkbook - or funny looks from "she who can't be ingorned").
That said, I am shooting with a K5, and have found that when up on the tripod, that I rarely use the viewfinder, preferring the Liveview, especially with the focus zooming. That even right there even more reduces the need for eye level.
The head is going to really determine the full height - along with the ultimate total co$t.