Camera strap fuji x lens holder

I got invited to go on a photowalk in a physics lab (snolab in sudbury, ontario). The main challenge is that it s a full cleanroom facility. No camera bags allowed, just 1 camera, 2 lenses and a strap and whatever I can carry. I wanted to bring my canon 70-200 with a fuji adapter, as well as my fujinon 18mm f2. Came up with an idea, use the rstrap to clip to the canon lens/adapter combo, and made this to attach to the r-strap near the shoulder so I can attach the 18mm f2 when I'm not using it on