Steve,
You might of come up with an idea that nobody has tried. Adding a comp-tip to the top of an uncut mast to make a 34' H16 mast. Very interesting.
The comp tip is a 9' fiberglass mast section that replaces the 9' you hack off your existing mast, just above the mast hound. The comp tip is a result of lawsuits against Hobie because some individuals were electrocuted when their mast came in contact with power lines. After a certain date (mid 1980s??) all mast were made that way and Hobie offered a free upgrade to earlier versions (that ended a couple years ago). All H16 class racing requires that you use the comp tip. Most sailors dislike them because they flex at a different rate of the aluminum and weather quickly in sunlight.
Jack