Gitīer done Wally!
Thatīs big boy allright.You could make a sort of Y- connection for the 2 wastegates and mount them a littel further away.As long as the angle of the pipe is in the direction of exhaust flow it will work just like a shorter connection.It will work trust me,aircraft bleed air systems have such junctions all over and there is never a problem with lack of response.