I just think the Blichmann false bottom is the best.
I am not a fan of the Blichmann design. In my humble opinion, it's a bit of a hack. If you are going to use a false bottom, your money is better spent on a slotted design (that's what's used on commercial tuns). A 16 to 20% open-space slotted design false bottom is a work of art from a mash bed fluid dynamics point of view. What is the diameter of your tun?
The Blichmann is the best one I have used. And I still have it so I might as well use it. The only other one I have used is similar to the one that came with this unit and what you show in your pics. Just holes in a stainless plate. I would definitely like to try the slotted design you speak of. Now I wonder if it would be easier for my son in law to make a new slotted one than cutting a bit from the circumference of the Blichmann... I'll have to ask. They do have a water jet cutting device.
The diameter of the new MT is ~15.5".