Here is my thoughts on DW as a tell. If the person can see the font of your DW, they most likely can see your timing ring. I would think that if you knew exactly what the font was supposed to look like, you would definitely know what the Timing ring is supposed to look like or the beat of the movement. It is only us on these forums that can tell.
By all means, I am not discouraging anyone from buying DW, low beat and other mods- I do. To me I see it almost like a challenge to try and get the rep as close to Gen as possible, that is the fun in it to me. I probably spent more money than I could have bought the Gen diver for in buying parts to try and perfect the rep diver. I definitely have over 2k in crystals, Cyclops, dials and other parts that I did not use, I just bought them for experiments to try and find the closest to gen.
My point is we all mod these for different reasons. But if the dial is a tell, than does it matter if a few if the numbers on the DW are a tell. I strive for perfection with my reps, but that is the fun for me. Remember on social media or in pictures it is easy to study and someone will always be able to tell (and they would be a member here) but day to day on your wrist is a lot harder to tell.
Stay thirsty my friends.