I'm sure you can combine them, you would just have to be creative in how you do it. The 3D printed pieces on the chameleon academy website are designed specifically for the reptibreeze enclosures so those won't work for the DS combo you are hoping for. I feel like if you have a longer PVC...
You could also try to steam cleaning your plants after you wash them and sanitize them. If they aren't super expensive plants, I would suggest replacing them just to help avoid re-infection.