As you may have noticed from the postings. Is there any way that there could be a link from the top of the 4 man to the single man lift .It would be a shame to waste them runs for the whole season . There are quite a few people that would pay for this service . Maybe next time you are in Borovets you may take it up with the people that run the lifts maybe they could set up a tractor and cart!!
Regards
Frank