First of all, I think that chromed tank badges are probably the best option when it comes to tank decoration. Just look at Triumphs. I hate those cheap, decal decoration. It's the icing on the cake.
Now to the point. I didn't care to look or pay for the tank trim on my CB350, so I just bought automotive tank trim and put it right away. I think it looks great. It's adhesive, and as somebody has pointed out, it's tenacious. Nevertheless, even when the trim is flexible, it tends to peel off at the point with the curve is tightest, at the front of the tank, in one of the extremes. It won't peel off in the middle of the trim.
If I were you I would be concerned about two things: if the badge would tend to unstick with time, or if the adhesive will take the clearcoat with it. I had the finish of my helmet tearing off when removing an adheshive; I wouldn't want that on my tank. I would pre-shape the badge first, and probably, use just the ends of the adhesive strip, you don't need to use the full lenght.
If you need to remove it, do what I did with my car badges: dental floss and then clean the mess with your fingernails and alcohol. The clearcoat will dull with the alcohol, so be gentle and stop to let it dry and see what's going on. Luckily, a little polish will bring the brightness to the clearcoat again.
