I've owned bows tillered both ways, and shot both ways, and the only accommodation I make is to change the nock point. If I'm shooting 3 under, I nock at 5/8" and maybe a bit, split 1/2". I've never paid any attention to whether the bow was specifically tillered to favor one or the other. I've talked with any number of shooters who feel the same. I started out split, then switched to 3 under (and two under). I had a bunch of bows, and just kept shooting them all. When I switched back to split, again, just changed the nock points and kept on shooting.
A point that has always bothered me about the emphasis on this is that recurves generally come made to shoot off the shelf, but many folks add a raised rest. Other than nock point, it doesn't seem to bother the bow.