Now that I've evolved to 99.9% SRT climbing my linesman rope doesn't get much use these days, only bring it on the rare occasion I'm stick or ladder stand climbing. When I was stick climbing regularly though I found oplux to work fine and of course it's very stowable.
I started using oplux as a linesman belt not long after I first got my hands on some. I used it with a ropeman1 because it was all I had, but knowing full well doing so was at the margins. To mitigate that a bit I always use a large and fully round carabiner line the Rock Exotica Pirate to maximize the cam pressure regardless of biner orientation instead of my more compact and forged (flat sided) DMM biner's. I always tie a stopper knot too.
Most climbing ropes I've used tend to be a bit too supple to use as "conventional" flip lines, even as the thickness increases they are somewhat droopy requiring two handed management. There are a few like the sterling htp that are fairly stiff tho and would be easier to manage even one handed as a linesman belt vs something like oplux. However, as mentioned the stiffer rope doesn't stow too well. So there is always that trade-off.