RoD's Joker is also a pilot iirc, so assuming skill translation to fit the world he could at least make a stab at standing in for ME Joker, but with his bone problem I can't see that Joker doing well in either of the others' roles, though his personality is unlikely to attract vigilante attention. The mad clown is too unreliable in any sense to work in a spec ops team. The only good thing is that Shep would slam the brakes on hard and is free of Bats' aversion to permanent solutions to his kind of problem.
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows