If you want a new one in weapon form, simply make it a Rare item as the Thief's knife is, with the stats being the same as a Thokcha. It would basically be a Thief's knife +1, rare so you can not have both, and THF's are not requested to DW them. With 47 damage and 194 delay it fits what most +1s do, lower delay and higher damage, in this case it is a bit different, but not completely, as trials often change the levels of gear while keeping them rare and unable to wield both. I am sure SE could tie them together in that way, and with those kind of stats, it would not beat a Fire Thokcha, but it would be a ton better than what we have right now.