The Fenix Shillboy
Join Date: Aug 2007
Location: League City, Texas
Bikes: Raleigh F500 mountain bike and an exceptionally old (mid-60's) Schwinn Collegiate 5-speed.
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Two things that might help, but I dunno.
First, on one of my Internet surfing expeditions looking at bicycle light mounts, I saw a Minoura Spacebar that was longer than the one I have, with an extended base. I'll try to find the link and post it (if that sounds like it might be one of the things you need).
Second, I think that if you wanted to extend the length of the round mounting bar (the bar that you actually mount the lights or computers to), you could remove the end plugs and find a dowel of the right diameter to fit into the ends of the bar. You'd need one short length of dowel for each end of the spacebar (if desired) but could extend it however far you wanted to, within reason. You could likely find a length of dowel close enough to an exact fit at just about any hardware store. If too big in diameter, just sand it down a bit or if too small in diameter just add something like electrical tape and slip the dowel into place inside the tube. You could paint the dowel black to match your space bar (if yours is the black version). Anyway, that might be one way to extend a spacebar.
I don't know if that's the kind of solution you might be looking for or not (I was trying to follow your description, but not sure if I was in sync with what you are looking for).
(This doesn't apply to what you're asking, but two spacebars could even be joined to span the handlebars across the stem by using a length of dowel between the two.)