Frank - I have done what you seem to want - but on a 30. Got tired of dealing with the traveler which came as a 2' unit across the footwell of the cockpit, just in front of the wheel. Had to stand on your head to use it. Moved to a windward sheeting traveler (from Harken) just behind the companionway. Works great in any weather. The only problem with the windward sheeting mechanism is that in light air there is no force on the mainsheet to release the traveler. But, in light air you don't have the problem of trying to release it from the rail.

To address the force on the mainsheet, I bought a spare small vang assembly (4-1 set of blocks with 30 feet of line and a cam cleat attached to the blocks at one end). I attached one end of this to the main sheet and the other to the main sheet block (lower end with the cam cleat). My 4-1 mainsheet still works normally and when you pull the line on the 4-1 vang, you get 16-1! Great for fine tuning. Similar assemblies are in the Harken catalog, but they are megabucks. I was able to use my old mainsheet assy and the inexpensive vang assy for a total outlay of about $100 US. If you want a further description I can fax it to you or try to scan a drawing into the system (I'm still learning to use the technology).