Thanks for the reminder on that. Can Forged do new Warlock invocations? I thought I figured out (or read?) that it could not. I think my 3 current characters all fall into the "can't do it" category (Mystic (awaiting the supposedly soon-to-be-released 20-level version), UA Ranger, and Warlock with UA invocations)..
It's a bit of a work around but you could add them as Additional Active/Ability Features next to section 8 on the start page.