3 handed button straddle

[Dantes]

Live middle limit game. RHO starts straddling on his button every hand. He is a strong player and my LHO is the real target. If I 3-bet my SB I'll likely not be getting rid of the LHO regardless which means if I play Ax etc it'll be 3 ways for 3+ bets for sure, something I wasn't real happy about. I wound up following suit and straddling my button as well as tightening up in my small blind but I was in a real bind here in this situation and not a lot I can do. Any thoughts?