Dan
Great question
Here is my solution, milling less than 3/4" wide presents feed issues on an industrial style molder. There are 3/8" feed roller available but you would be milling about 1/4" more off each side than normal.
By doubling up the profile and making a 5/32" wide splitter in the middle of moulding knife design you create a few things in you favor and a few safety concerns as well.
The lumber should be clear with no knots, by doubling the profile you have better hold down conditions on each piece, you double the production in half the amount of time, you are able to utilize fall off rips of lumber from the rip saw, a wider feed roller in front of the left cutter head provide more feed pull power. The two pieces of lumber are separated by the last bottom cutter head that is taking off .020".
The safety concerns are splitting lumber operation should have an anti-kickback device on the machinery, the splitter knife is about .010" from the metal bed plates, a wooden or phenolic bed plates is an option. The last piece of lumber will not self feed out, it's the piece behind it that pushes out the lumber in front of it. So the molder is a push feed not a true thru feed molder. NO KNOTS, they create flying objects when these small moulding are being milled.
I added a picture to help understand one way it could be milled.
I hope that helps
All the best
Russ @ MR