Dukes are soft enough you can bend the trigger like ADC and cut notch in the lever and make it a push/pull. No need to even cut the rivet like ADC did. Same process just sped up. Isolate on the trigger where you want the bend with pliers and look at ADCs photos for notch cut. Simple and quick.

Nice work there!
I did those very same mods on a bunch of my DPs 6 years ago, except for putting the dog on upside down. You are correct, the geometry is wrong if you don't do something to change the angle of the dog. I simply bent the dogs to get it right. I wish that I could now take my dogs off and put them back on upside down, but that would put my notch on the wrong side now.
One thing that I also did was use a fully threaded bolt for the trigger pin, and used a nut on either side of the trigger to hold it straight, and relied on the bolt to swivel at the trigger bracket at two points instead of one point at the trigger. I find that the original trigger gets gummed up too easy with sticky bait or rust. That has always been a pet peeve of mine with DPs.