Parallel (2) 20 amp 220 12 ga wires into one 30 amp 220 Breaker OK

I am attempting to replace 2 ovens that currently each have their own dedicated 20 amp 220v circuits. (12 ga wire)

My new modern GE double oven requires a single 30 amp, 220 circuit. (10 ga wire)

Since they are dedicated wires going to the same place, and my new 30 amp 220 breaker accepts (2) 12 ga wires, can't I just wire these in parallel? Red to Red, Black to Black, White to White? Two 12 ga should theoretically be good up to 40 amps, and I am only going to ask for 30 amps tops.

I know it would be better to pull 50' of dedicated 10 ga cable but it would be very difficult with my home layout. Unless one of the paralleled 12 ga wires spontaneously broke by itself I can't see any danger such as the full load of 30 amp attempting to be carried by the single 12 ga wire?

Or,,,, should I stick with the 4 breakers I currently have, (each 20 amp), and just join them at the connection to the oven… That way each breaker is protecting a single 12ga wire and would trip if any one of them went individually over 20 amps. (it may sound strange but the current configuration has 4 separate 20 amp breakers,,, not 2 legs ganged/joined together.)

I hope that makes sense.. Thanks anyone for your help!!!

Herb