Sounds like the color will take care of itself, but I agree that filtration and/or lighting will be needed in B&W.
Any way you can capitalize on surface-textural or reflective differences between wall and tools/props with direct or tangential lighting to bring out differences, with or without filtration? Might make for a more abstract, less literal interpretation of the scene, if this does not conflict with your purposes. Sounds like ambient light levels are probably fairly high; what about foamcore reflectors to get more light where it's needed, with or without strobes.
Efke 25 is orthopanchromatic, is it not? Might tend to make the problem even worse, rendering the red even darker. It may not be the best film for the job, but perhaps it's what you have on hand--certainly understand that! If other films are a possibility, what about IR films as an interesting experiment? Just an idea.
Sounds like an interesting project. Hope you'll post the work and link us to it when you've finished. Best of luck with it.