I suppose it might be a bit of a faffy job rewiring a small lightweight headset from parallel receivers to independent. You'd need at least a five-core cable (one pair mike, one each receiver and one common return) and since such cables aren't readily available you're looking at six core straight away which is a greater diameter and therefore needs a bit more room to terminate in the set. Ideally, you need tinsel cable as well which although is more or less infinitely flexible is a sod to solder and so has to be crimped, fastened, screwed etc.
IMHO, the venerable grey plastic product familiar to NATS made by a large acoustics company near London is/was the best for the job. Pricey, definitely, but sturdy and fairly simple to fix. It would unfortunately appear to have been superseded to some extent. Its black rubbery successor is technically identical but not nearly as robust and lightweight to the point of slipping off one's bonce !