The reverse spider is a very popular fly out here for Sea-run Cutthroat. I believe Mike Kinney, who is credited as the fly's creator, prefers Amherst Pheasant tippets for the hackle, because it is stiffer than hen hackle and doesn't marry back together like duck flank. I have tied them with hen, duck flank and pheasant tippet and all worked. Yes, the hen hackled ones look very much like Tenkara flies. I think your version looks good and should work well.