Not sure if this has been discussed by anyone or not, but I felt like it deserved some attention. To the best of my knowledge, there currently is no way to craft gear for the relic scavenger unless it...
The only one I know of that saves a ton is the mk3 holo projector. And it isn't too hard to find a character I'm not gearing anytime soon that needs one. And I'm at almost 6 mil gp. So at 4 mil gp, it shouldn't be an issue.