Well, I started at 8:30 and finally had the new tube in the tire and blown up at 11:30.
Boy! I wouldn't want to have to try fixing a tire on the road. Thanks all for the various suggestions. Fortunately, I didn't have to remove the brake assembly. But instead of 4 kicks, it took about 40. Discovered something though... as the crack between the wheel and the brake assembly widened just a very wee bit, I put the QD axle back in as I had to roll the bike to get the center stand back on the center of the blocking I was using to get the wheel a little farther off the ground. Before removing the QD axle I continued a kick or two and the wheel came loose almost immediately: maybe the cush rubbers like to come straight out? Next time (I hope there won't be!!!) I'll try removing the right hand spacers and replacing the QD axle before starting to kick the wheel.
The next tough thing was getting the new tube's valve and the little washer back into the hole in the rim. That was fun and games, not to mention the mutteration of many words to the mountains (the moutains didn't help a bit!). All I have to do now is get the wheel back on the bike. Think I'll wet down the cush rubbers with some water laced with dish soap. Considering the difficulty of getting the wheel off the cush lugs on the brake drum I can just imagine the fun I'll have this afternoon trying to get it back onto 'em. Like they say, "Live and Learn!"
Seems to play out the old mechanic's rules:
1. If it says its easy in the manual, it won't be.
2. Workarounds are the order for the day.
3. The first workarounds never do.
4. Swearing and cogitating are beneficial. Not necessarily in that order. Sometimes.
Again, many thanks for the great help and advice! It got the job done. And I did find the chain undo link. The clip was indeed colored yellow, and it was indeed on the inside of the chain, though why they'd put the thing on the side where it's hard to get at is totally behond me.