I hear you on the seat. I tried a Cee Bailey's, but it had too much memory foam for my weight. Cletha's Cee Bailey's is awesome, but the one the made for me just didn't cut it. I sold it and sprung for a Russell Day Long and it's just as comfy as the last one I had. But as you indicated, they are not very friendly to a tight time line. Especially this time of year. Bill Mayer may be more understanding, since he's more familiar with the LD community. Rich's in WA might be worth talking to as well, if Bill doesn't work out.
There is also Spencer, which is a bit different. Some folks rave about them, others not so much, but he does seem to work with people to get what they
http://greatdaytoride.com/Home_Page.php]need/want.[url]http://greatdaytoride.com/Home_Page.php[/url]
Saddleman is another option, though more expensive than a Russell.
http://www.saddlemen.com/] [url]http://www.saddlemen.com/[/url] They have a tailbone relief seat that has some good reviews. Just depends on your issues and needs. There were some forum posts about getting a seat done with the stock cover for ~$200, but I don't have details. Might be worth a phone call or email. Their Adventure Tour is $350 for the solo seat option.
Another option that I found with a search -
http://www.tscustomseats.com/ Tom Simmons. Looks similar to the RDL design. Pricing is kind of high and he's prone to back rests and double seats, but might be worth talking to for a solo seat. He's in AR and if you scroll thru the photo gallery, there are some Sport Touring bikes and others that look more like what you would want, rather than the huge double seats on scooters and trikes with back rests.
Seat Concepts - This might not be more than a stop gap, but for the $159, perhaps better than beads and a sheep skin.
http://www.seatconcepts.com/products#!/~/product/category=1671359&id=15531733
Corbin and Sergeant are off the shelf seats, both widely discussed as being hard, but they work for some people. Not a direction I'd go, but honestly I haven't tried the Sergeant either, but did have a Corbin on a SS750 that was ok. never tried it for long days though.
kaoka throttel lock - $115
http://www.yamahasupertenere.com/index.php?topic=8201.0 (if you like that style)
Potential GPS cradles if you have a Garmin 450/550 -
http://www.yamahasupertenere.com/index.php?topic=7938.msg0#new