I've seen at least one in two pieces that looked as if it were made that way, but I looked for a picture last night and haven't found one yet; if you do it nicely, who will know, though -- or make it look like it broke
. I think its more than fine and common NOT to go over the comb. Also, just to put it out there, not all E. Tn. rifles have the same tang. There's the Soddy-Daisy rifles and others (e.g. Selvidge, and I think Kellers) that have thick long tangs that end before the comb and have 3 screws. You could probably also get away with long pointed tang with 2 screws or any number of other variations.
The best thing to do is find an original that you like and copy it (or use as inspiration) in these sorts of specifics -- there is a lot of individuality even among rifles from just E. Tn, or even just Upper E. Tn.