Hi!
I have my own walking and wildlife holiday company in Bulgaria called Balkan Trek:
Bulgaria - Walking and Wildlife (Holidays in Bulgaria) and we are very much involved with various conservation initiatives and projects in Bulgaria. I thought you may be interested to know that there is a major campaign and project currently underway there for the conservation of tortoises. It has an English-language version to its website which may be of interest to you:
Conservation of Tortoises in Bulgaria - [BSPB]
Best wishes and good luck with your work!