I would use HDPE SDR 13.5 with a pre installed mule pull tape. Cheap about 35 cents a foot.
Yes that tape would work fine....You will never pull anything through there again....simple.....The insolation of coax is soft...Any soap or lub will dry....That coax is so weak and had no strength to it...Common people....A tiny piece of copper, and some outside braiding........When new its weak....Any thing that is not made straight, has more drag....String, coax, anything....conduit is straight and made that way...no wiggles less friction the longer the run.....When you pull anything it creates drag...more drag more heat....Ive seen string completely put a grove in a PVC 90 elbow...Guess what...The head never makes it past the groove and then string snaps....you need to add cables later, dig it up, or add another conduit.....This isn't #12 or 10 awg, wire your working with...bogus weak coax...