Bud,
Why not give it a try with your Canon? Just checked the specs out for this camera and it does have a VGA 640x480 movie mode. For onboard ride vids this is fine. I recorded last summer's Alps trip with a digital camera having the same specs. Can see the downsized movies here:
http://www.bmwmoa.org/forum/showthread.php?t=11890
Maybe your battery power isn't great, but I typically don't record ho-hum roads. You can always just record a great section you know is coming up.
Couple of challenges...
1). How to mount on the RT. This isn't an easy bike with the tall fairing and such. Have found helmet cams to be most versatile with the RT. Neverthless, you can be creative like with the cheap mount found here:
http://www.aerostich.com/catalog/US/...t-p-16289.html This mount doesn't work well with MiniDV cams because the weight causes some shaking with this not completely stable mount, but for lightweight digital cams like your Canon it works fine. It is what I used for the Alps ride.
2). If you don't bring a laptop on this trip, or have multiple flash cards to store the recordings, you will be limited to the capacity of the one card you have.
Your trip can be recorded inexpensively. I'm in Santiago, Chile next week on biz, and hanging around for four days following with a reserved KTM 950 ADV waiting in the wings. Will be bringing the digital cam and ultra mount just like I did last year out of Geneva. Simple and cheap -- increasingly, just how I like it

.
Steve
Bud just checked the A530 specs again. The frame rate of 10fs at 640x480 is very poor for motion video. Need 30fs (Frames/second) for smooth motion. NEVER MIND. Maybe you can find a nice and inexpensive digital camera offering this movie mode spec.