I have both Foundation and Foundry installed in RW7. When I open my Foundry project and open Help, “Foundry Support” shows in the drop down help menu. I do not see the problem as you describe it.
ZeeBee explained in another thread that the Help Support link is derived from the Master Theme settings and not from the Theme you are using. This means that if you are using a theme that is different to the Master Theme then the Support link is incorrect and doesn’t function as a support link.