@mindless1 is right.
Your problem is that two #22 AWG wires carrying AC are not equal to a single #12 AWG wire. Such a combined wire would probably have the equivalent carrying capacity of closer to #18/19 AWG. To get a #12 AWG analog, you'd have to twist two (approximate) #15 AWG wires together. In fact, using #22 AWG, you'd probably have to simultaneously use about 11-12 sections of #22 together to get a #12 AWG analog.
And, there are safety issues even if you come up with a combination that equals a #12 AWG. If you are manually winding wires, you can't be sure you won't make a mistake. And a mistake on this type of thing could get you or your family killed if a wire overloads, melts, and starts a fire. Or, it could simply burn up your appliances (the replacement cost of which would be far in excess of the cost of getting the proper wire in the first place).
Finally, beyond safety, there are also the legal issues. In the US, it would be a violation of the national electrical code to do this within a dwelling. Elsewhere, it would depend upon your local codes.
Simply stated, it is a Very Bad Idea. Don't do it.