Two possibilities
1. Yup Paulie, the booms make excellent boom crutches, or similar supports to go over the deck for covers etc. I made up crutchy sort of joints as I needed wider support than the hinges -

On this one the pipe from a boom fits conveniently inside standard plumbing fittings and I heated the white central plastic pipe just enough to get it to bend into a support for the spars and sail. On another version where the tube was bent round to hold the clew, I cut the tube at the apex of its bend and again using internal rope (to hold it together and onto the boat), I simply used reinforced hose, the curved tube ends fitted inside this making a soft support for the spars. With bent windsurfer booms it is possible to use the two sides in an arch giving more room underneath it. The white pipes in the foreground are one with the stud clips and the series of holes to match, though this set is lightly built, being from an occasional camping table - the windsurfer versions are more substantial; see 2. below....
2. I have been toying with home made, two-part oars for some time and Phil Oxborrow has kindly had several goes at making the stud clips that can be used to separate the sections. He's finally come up with something that meets my exacting requirements. However, on the grounds that you can't have too much of a good thing (??more oars), save as many pairs of these studs as you reasonably can and I'll take a few off you at the Thames Raid or whenever, if you would be so kind?
Chris W