Two of the following rebate cutters, with a bushing between them the thickness of the tenon you want, will go to 74mm depth, and 31mm high. ? These is what I use:
T-max on the dado cutter is not specified, but maximum depth of cut using it as a groover is 34mm because of the inner hub projection. ? See photos below:
I have the 700 series shaper with the 230mm hood. Are there any other options for tenon cutters that will get me 3 inches or so of depth that you recommend?