I know what you mean.
The Indian's shown in "Royal Enfield-By Miles The Best" have a nice oval shaped decal with a small Indian head at the top and a "Indian" logo at the bottom.
If I had to guess I'd say they are about 5 inches long and 3 inches high.
I haven't spent a lot of time looking but I haven't found anyone offering one like this.
The only bike that book shows that is using the script Indian logo is a 248cc Fire Arrow but probably less than 1/4 percent of all the people looking at your bike would know that.
The script was used and the gold color will go nicely with the black metal flake paint.
I'm sure your all ready for the, "Indian never sold anything like that bike! Who do you think your kiddin'?" remarks. There's going to be a lot of them.