I have flown many high and shoulder wing planes with anhedral to correct roll with rudder and have yet to find nd downside to doing it. I have literally cut several wings apart to add in anhedral and just used heavy weight fiberglass cloth and epoxy to re-join the wing panels.

Here are the rules for dihrdral effect:
Dihedral, sweep back and a high wing location will cause roll in the direction of rudder.
Anhedral, sweep forward and a low wing location will cause roll opposite to the rudder.

Knowing this, you can understand why I tend to laugh when people think that taking all the dihedral out of a low wing will make the plane fly better. Several times I have had people with flat low wings fly level and put in rudder and watched the plane roll the other way. A flat wing only works if it is non-swept and mid located.

You have to balance the design for all these factors. Generally, 3 degrees of anhedral works pretty well. Most of the time I invert the dihedral brace, but if it is not enough, I cut a new one. I fill in the gap with an old piece of TE stock. You uslally have to trim the wing saddle for the downward angle and may have to use a rat tail file on the dowel holes.

The first plane is a World Models Happy Fli with a piped .32
Second is an Easy Sport I modified with anhedral, 2" ailerons, 3" elevators and 4" rudder and .61 powered. Made a great little airplane.
Third is an old Eagle trainer with an ahhedral wing.
Fourth is another view of the Easy Sport.
Then there is a sort of MiG combat plane
Finally, a couple of shots of a Joss Stick with anhedral. The Joss flies excellent knife edge.