I have interchanged my feet between my Janome and my Featherweight and other low shank Singers, such as the Model 66. I just remove the shank that the feet clip onto.
In fact, before I realized I could do this I had already paid $35.00 for a Janome walking foot, which I don't like. I went into Joann's and bought a generic walking foot as a trial for my Singer Model 66 as a trial with the 40% off coupon and it was less than $10.00. I now use this foot on all of my machines including the Featherweight and Janome.
I believe that as long as it is a low shank it is interchangeable.
I received a catalog from "Neward Dressmaker Supply" www.newarkdress.com" which has a set of attachments (9 pieces) for $9.65 which I was thinking about buying. I believe the feet should all work however my Singers don't have the zig-zag functions.
I am no expert about machine feet, however I believe Charlee is very knowledgeable about them. You could pm her and double check with her.