The sleds contain some.
I have checkd a LG 22x sled, it contains 3 mirrors/dichros und 2 lenses.
The biggest mirror, wich is close to quadratic, works for combining red and violet.
I think best way is let lase the 405 direkt trough the best working side and mirror the red in from the side.
This cost much red but normally you have more red then 405.
daniel