My recent experience...
Wow- those naked shifter braze-ons are UGLY. Knowing myself, I'd probably forget I was clipped in and fall over, sticking one of those suckers in to my thigh or knee-- depending on if I fell in front of kids or pretty women. So...
1) Easy, looks OK... get out your Dremel tool (mine's a Hitachi, but same thing) and use the cut-off wheel to whack down the shifter boss close to the downtube. Better a lot too little than a little too much! Get out a file, and take the square portion down nice and flat and square (tangent to the tube)... stopping 2 mm from the tube. Sand and prime, paint it a cool contrasting color. Black Testors Black Glossy gives you a black diamond, which looks ok. It won't gouge you, and it's quick and easy.
2) So... I look at that thing for a while, but it's just not right. Get out the file, and spend a couple of evenings filing all the shifter boss and brazing metal off the frame, ever so carefully. When I got tired, I went away and came back another day. It took me 3 days. When I painted, you could see I was off by 0.003 inches or a little more, so I carefully filed the high points off and finished with 400 grit wet/dry. It then painted perfectly. By mixing two spraycan colors, I actually got a pretty good match! It took 3 trys, carefully sanding off my first two attempts with 600 wet/dry. OK! That looks pretty good.
3) Get the bike decals for your bike! OK, it's not always easy to find them- but hey! LOOK what I found! For a LeMond, I bet you can get exactly what you need pretty easy. LeMond... that's a pretty nice frame you got- may as well do the job right! Clear-Coat over the decal,,,
OK, you could also paint the whole thing flat black with Rustoleum, but it's still winter- what else are you going to do to avoid time on the trainer?
'Meat
ps- the wheel builing gods have my frame- they are building Velocity Aeroheads on to my IRO 28 hole 126mm flip-flop hubs with SS double butted spokes they cut in the shop. Pics in about 10 days of the final build...