Hello! I hope I explain this correctly.
I had transformed into Werebear form and was switching the Werebare abilities around to my preferred hotkeys but ran out of rage in the middle of doing this and transformed back into a human. Now back in human form, the window with my Werebear abilities stayed open and to my surprise I was able to add Rampage to my Human hotbar as well as use it. Testing it further, this was not limited to running out of rage but I was also able to open the window, press my hotkey to transform back into a human, and then put the Werebear abilities onto Human hotbar. I was able to do this with any ability in both Werebear and Spriggan forms and although I do not have Swamblade unlocked I imagine it would work for it as well.