Wow must cost a fortune to heat that house.
You could probably build a whole new room up there, that's kind of an inefficient use of space other than the coolness factor.
The poles as suggested sound like the best idea. Ladders become kinda unsafe at those heights given you have nothing to put it against to get proper reach.
Reminds me of my church when the projector bulb went. They had to get scafolding and whole 9 yards in there just to change the bulb. Kinda funny when you think about it, all that trouble for a such simple task.
Oh another thing, if you can indeed get into the attic, what I'd do is add an access door beside each fixture that you can open from the attic, you could open it and stick your arm out to change the bulb. This may be messy if you have blown insulation though. I'm guessing there's no attic though.