It's all looking great. The paint jobs on the infantry are really good. The Russians in particular are looking really nice. I often find that my Russians blend into the background color, but those really pop out. I'll be looking forward to seeing how the Blucher bases Druid created turn out.
The flags above are actually printed (paper) and glued on; they must be since the Deployed models don't have flags. I only use paper flags myself, but I know preferences vary. This is one reason I make everything available with multiple flags, when applicable. But when I was doing the Wagram flags I began to wish I had just printed the flags onto the models and tried to paint them. I ended up gluing on about 400 paper flags. Ugh. No fun. Certainly French flags are very easy to paint.
I tried flag poles like what you described but they tend to be very fragile. That said, to swap out paper flags all you need to do is soak the entire model in water. Latex paints should be fine in water. The glue softens and you pull the flag off. Just let them sit for about ten minutes in luke warm water.
What I do on the flags is to take the Warflag.com flags and print them out. The .JPGs from Warflag are in groups of multiple flags, which is important. What you can do with most of the flags is, copy the entire image into Powerpoint, then shrink it until the individual flags are the right size. Then make a bunch of copies. Print them out, then cut out the groups of multiple flags. Glue those back to back with the same sort of flag, and let them dry. After they dry you can cut the individual flags apart and you'll have a bunch of two-sided flags. Then, hit the middle figure on the base with thick white glue. Either slot the flag between two soldiers or against an officer, or glue it so that the back of the flag is against the front of the soldiers. You can also give it a little bend over the top of the soldiers so that the flag will face upwards at an angle and be easier to see. This is much easier if you cut the flags apart while they are still a bit wet, then glue them to the figures. They'll still be foldable that way. Another way to do it is to angle the flag so that one point is touching the ground and the other point is in the air above the figures; it looks like the flag is hanging down. Anything between that and parallel to the ground will give a sense of motion.
Designer and owner of Forward March Studios: The World's first comprehensive range of 3D printed historic miniatures.