We’ve already done this with one of your images. You had your PhotoLab version of a desaturated colour image and starting with that image I was able to create a much more BW film version of the image.
I don’t know how much BW film you shot and how many prints you developed in BW yourself. I date from the epoch to have done this. Smooth mid-grey desaturated colour images do not make impressive BW image. BW photos rely a wider gamma of contrast for their effect. Crowding the shades of grey into the center of the tone curve makes for very boring images.
If that’s what you want, leave the images in colour then.
I may decide to do another extended demo on BW images but not soon. Sorry.