Thanks all!
Well, I'm back from Vienna! I decided to take my black epsom Birkin instead because it was easier to choose my outfits lol!
I went to Hermès and they had a beautiful 30cm Birkin in rouge imperial, suede leather, with palladium hardware. The SA said that rouge imperial only comes in suede ... it's not so lipstick red as rouge vif and not as dark as rouge h. I find rouge imperial to be a very good red neutral. I didn't get it because I'm not a fan of suede leather, but the color was beautiful.
The SA also confirmed that swift should be alright with rain.
I didn't get anything from H, but got other goodies (my main reason to fly to Vienna this weekend).