Gonna be a very miserable fight, hope you got revives, you’re gonna need em🙏🏽
If you have him ranked up and fully boost before the fight you should be able to take him down eventually. Will cost you a lot of revives for sure but if that's one of not too many fights that you don't have counters for it's probably worth doing anyway.
I used r3 sig 40 Diablo with recoils and took me 4 revives. It was fantastic for not being sinister, pretty good option if you have recoils unlocked and a r2-r3 Diablo. (Diablo awaken ability reduces ALL damage by a %, keep that in mind).