I like the "Einigkeit" design a lot, as long as it'll be put on a large piece, so that the detail comes out. The church adds much depth to the design. If it hadn't had a denomination, I might well have gone for it.
The symbolism on many levels is meaningful. There's civic protests confronted with parliamentary debate, both leading to unity as long as there is understanding, tolerance and willingness to compromise. There is a historical progression from the street protests to St. Paul's (yes, I remember visiting that church with you; very impressive) to parliament. Democracy at its very best. There is the point of parliamentarians representing the people as well as the people lending their faith to parliamentarians.
I do not agree that the design would have been good for freedom also. Achieving freedom starts with an upper class of some sort, leaving all other people without a voice and it ends with the people taking power, which is where unity starts, as in the unity design. Freedom is never unlimited, my freedom ends where yours begins. Organising in a parliamentary democracy is in fact surrendering part of your freedom to a trusted parliamentary representative, who should act in the interest of the whole country, not in any individual interest, least of all his own.
Peter