May it be an idea to look online, and see if locally to the area you wish to visit there is any local society concerned with History, especially War graves, and contact them asking for assistance and advice? Is there perhaps a twinning arrangement with a British town or city that you may be able to speak to? Or perhaps some organisation like the British Legion may have contacts in the area, and be able to assist with arrangements to make a "side-tour" from a more regular coach tour? It really does seem as if it ought to be possible to solve this, somehow.... good luck!
