Yes, common on domestic VHF-FM radios, though they may have a 300 ohm input or a 75 balun. The only small innovation/variation on this (as with G5RV) is using a specific length of twin as a matching stub, though I'm not convinced that an air core balun for 40 m at the drive point and coax isn't better. I've also used CRT LOPT core with coax wound on it at the feed of a random wire.
Also low loss twin of any impedance is plastic spacers (width depends on diameter of wire) and a pair of wires. Also if you want to use a tuner (match box), then that works best with no twin feed, put it at the feed point, and then the important thing is avoiding a half-wave (or maybe full wave) as most tuners can't match that.
Mike EI9FEB