Your vet's probably thinking worst-case scenario with the hand luggage idea, but with the right prep and support, it can be done. The key is finding someone who actually knows how to navigate UAE animal import laws and won't treat your tort like just another "parcel".
When I moved, I used...
Here are some foods you can easily find at Asda, Sainsbury’s, or Tesco that can help add some variety to your tortoise’s diet:
1. Leafy greens
2. Herbs
Sometimes tortoises can be more active than usual during the process, which can be confusing. The weight loss you mentioned doesn't seem too drastic yet, but it's good you're keeping an eye on it.
For the lighting, I’d suggest placing it in a spot where it covers both the basking area and a cooler shaded area, so your tortoise can choose where to hang out.