Regarding scaling a template:
Do you need to? You say you don’t particularly like the handle as is, so if you’re making a new one, why not find a template that fits?
Anyway, here is a few options:
If you want to replicate an existing handle, you could stick it in a photocopier/Xerox machine. That would give you a black silhouette of the handle. The machine can make scaled copies of it as well.
If you are making a new handle from a template file (pdf, dxf, dwg etc) you can either scale the image before you print it, or the printer will be able to do it.
If you want the outer dimensions to remain the same, but with a smaller centre hole, print one at 100% and one at 90% (or whatever fits), and lay them on top of each other.