Bill,
You said, your BW grip fits and you want to replicate the grip. What I have done for several recurves Bear TD's (wood handles) is to make a pattern from another on cardboard. Set the bow on a flat surface, with a piece of cardboard underneath, (thickness found in a spiral notebook, or writting pad), then from a shadow, or with a Right Triangle, and pencil draw, or mark the outline of the grip (profile). You may be able to trace it with a pencil.
Next, cut the curvature of the grip with a razor or scissors, to see if the curvature on your DAS is the same, or what needs to be changed. If you can reduce the handle, to get the same grip, I would start there.
Once you have determined what needs to be done to the DAS, so the profile is the same as the BW, you will see where it needs work, and whether making a new wood grip would work. Use a pencil to shade the areas to be reduced.
I use the cutout as a guide when changing the handle. Reducing the area under the thumb should be easy, once you get the profile right, assuming you need to reduce the pressure at that point. Use a finish sander, or file and sandpaper to reduce the areas. Go slow, it is easier to remove material then to put it back.
Reducing the Handle on the DAS may be easier than making a new one, unless the grip is two side scales attached with pins, or screws. If it is a one piece handle, you will need to determine if the thickness is such that it can be reduced without cutting through.
If you want to make a new one-piece grip, it would be necessary to make a mold of the metal handle, and a reverse mold, which is more work.
I would also consider getting some help, if you do not want to try doing the work yourself.