Telemark-capable, modified tech toe pieces are not a new idea, but the corresponding bindings have only been available to buy for a few winters. The Meidjo from The M-Equipment has a more or less classic tech toe piece that snaps into the boot using tech inserts (assuming you have NTN boots with inserts...). In addition, the forefoot snaps with the boot sole into a movable "plate" under the boot, which produces the spring resistance for the descent - similar in principle to the NTN.
The "spring plate" can be blocked with a small wire lever so that it remains fixed to the ski and the boot only hangs with the inserts in the binding. You therefore have the completely free pivot point of a tech binding for the ascent. As an additional option, there is a tech rear jaw, which can be pushed forward with a lever for a fixed heel if required. The binding can be locked (like a tech binding), otherwise it releases in the limited manner of a tech toe piece. It is also possible to release the binding "at the back", where the boot hangs on the spring. The release value here can be regulated via a separate spring.