Good suggestion Jamie.
Yes. I've looked into sand casting companies to making the door handles both on the outside and interior with no interest other than making a thousand of them.

There is a way though, at least with the interior handles.

I'm fabricating the interior ones as we speak out of a Rodders kit that has the inner sprocket gear that attaches to the door latch crank mechanism and scratch making the handle. Should all add up with four pieces being lightened. I'll picture some

The exterior ones will have to wait till I find someone crazy enough to make a few or at least a very short run.