Yep. All it took was modifying a stock rss 0.91 head. It’s working on my blosxom testblog right now. The geolocated RSS 2.0 feed is here. Feel free to validate it. The modified head is here.
You can download the Geolocated RSS 2.0 flavour pack here. Change the coordinates to yours and enjoy.
This flavour pack is tested to work fine with Blosxom 1.2 and is based on the RSS 0.91 flavour that I snagged from Brutalhugs.