You should hang out with Query - he proposed making skates out of duct tape, lol. This is just as "out there."
Please don't imply that I currently advocate making boots out of duct tape.
It was a preliminary design, which did not pan out at all.
BTW low boots have a definite, even dominate place in the racing community, as do low athletic shoes for runners and XC skiers who race. But I think figure skates probably need more ankle support because the sideways forces are greater.
Co-planar boots are merely easier to mount, and easier to shift mount positions, provided that you find co-planar blades. They have little effect on the underlying physics or athletic motion. They are a great idea. But in practice co-planar blades are uncommon in the figure skating world, and are not made by the major manufacturers, so you would have to shim a lot to mount common blades on co-planar boots.
I encourage you to continue to develop your own designs. But if you can't afford mistakes, you may prefer to stay with proven designs, or with gradual evolution rather than radical paradigm shift.