I really like my Botanical Garden idea since it's not a war oriented UB, and Linné is really a hugely influential historical figure. (He'd better be represented as a Great Scientist in the game!) It should have a more modern prerequisite than Engineering though (if it's a Aqueduct replacement). The Botanical Garden is a 16th century concept, by the way, and is associated with the great universities of Europe. The first Botanical Garden in the modern sense of the word was planted in 1540s, and the first one in Sweden was planted in 1665 (the Linné Garden).
I don't know if this brakes some kind of rule though, that all UB:s must be available in the same age than the building they're replacing. Another idea for a mod would, by the way, be to make all UB:s available
before the generic building they're replacing. The more I think about this idea, the more I like it. Think of it like the Spanish UU - the Conquistador - a Cuiraisier that becomes available with Astrology.
Talking about mods, the Botanical Garden could also be a National wonder that requires a number of Universities. The effect could be an enhanced Great People rate in the host city. It might overlap with the National Park NW, though.
Another idea for a Swedish UP could be the Power of Compromise. This would have something to do with Civics changes, since Sweden managed to become a modern Western Democracy without a Civil War and without abolishing the Monarchy. (Sure, other countries have constitutional monarchies also, but the so called Swedish Revolution was a
really minor incident which swiftly led to sweeping reforms. Sure, some people got killed, but there really wasn't any transition period of "Anarchy".)
Also, in the 80s there was some major compromising being made under the table, when the Government, the Industry and the Labor Unions were all covertly in bed together. Nobody likes an ugly confrontation!
Just throwing things out there, use whatever you like. Or don't.