Man, I don't mean to be the 'turd in the punchbowl' here, but I wouldn't rely on a motorcycle as a daily commuter to work even if it was a new one- it just isn't practical. I know it is possible, and I don't mean to insult anyone that currently does it. It's just, let's be honest- weather is not under your control. Some days it will snow, some days it will rain so hard the car drivers are having trouble. Not to mention, if you rely on a motorcycle as your daily mode of transportation, you are on the road that much more, and that increases your risk of a crash exponentially.
Add to that you are on a vintage bike, and a lot of the parts have been discontinued and might be very hard (and expensive) to get in the future. Running up the milage on a CB can be done, and they will always be as reliable as a stone axe (that's VERY reliable!), but is there any other alternative? Maybe carpool and chip in for gas/petrol- that way you can leave your bike at home and still get a ride to work. On days where the carpool won't work, you can still take your bike.
That's what I'd do anyway- I haven't ridden in rain in years, and I won't purposely do it anymore.