This is about to happen and the base requirements I've met and passed. I've HQ'd astral oil from 0 but it requires.. yes Rapid Synthesis. I've toyed around in the passed (forthose that were smart and melded gear, you have CP) ........ with Ingenuity II + Rapid and it does quite a bit. maker's mark progress + PBP? + Ingenuity II RAPID X ?
We'll see but there is no other way. you may find you need High Quality mats since it may indeed take 60 Durability to actually near finish this stuff. Ideally you can get a precise touch in during the progress, masters mend II with 200ishCP left..... and either refresh comfort zone and hasty or basic/precise it to 20 to finish.