I have put some serious thought into this.
I have "re-engineered" my door frames and doors already, so I am somewhat committed to a non-standard config. But not ready to go public with the info just yet. But it is still a gull wing config.
The piper style doors have issues on pipers. So not sure I would copy them. They have two separate latches that don't nessissarly work that well. The piper door has flex issues due to the curvature and thin frame around the window. The RV-10 door frame shape is not such that it works well with two hinges at the front of the door. Also, one hinge would be in the fiberglass part and the other in the aluminum part. The positive is that if the piper doors do come unlatched in flight they will stay on.
The Cirrus doors have issues too. I have already gone toward this direction, but am not sure I will continue due to the issues Cirrus is having. Basically there are quite a few reports of doors coming unlatched in flight. The door stays on the plane, but everyone needs new underware.
The columbia door is nice. Take a look at the pilots side bottom skin and you will see the instructions on how to release the door incase of roll over. But this is very similar to the Vans design.
Honestly, the Vans design is looking better all the time. Why? Because if built correctly, it is quite safe. It should not open in flight unless you want it to, it was "not latched correctly", or there was a huge misalignment in the build. If you do want it off incase of emergency, open it in flight and it is gone.
I like the positive locking feature Vans design has. I like that I can look over and tell it is closed and latched. I just wish it was less "engineered looking" and more refined.
I can tell you from personal experience, redesigning the door is a huge undertaking in both time and money.
I would recommend to either keep it as is, or just do some minor modifications. But hey, this is experimental and everything can be done, but this is not a small job.