In reply to Death Star Constructor:
I was part of an Alpine Club Expedition in 2006. We made a number of first British ascents from the Southern side including Karl Marx Peak and Nikoladsye. It was sponsored by First Acsent and the Mount Everest Foundation, so a copy our report can be obtained from the MEF and The Alpine Club Journal 2007, or ask for Steve Hunt at the Alpine Club.
We flew from Munich, via Istanbul to Deshanbe, using Tajikistan Airways. We also had help from Rick Allen at The Great Game travel company.
Pik Engels looked quite difficult, but possible from the South.
Watch out for the Red tape,
Good Luck