It took me a [very long] while but I finally found two older sources pre-the filter change
Looks like the change was done in September 2014: viewtopic.php?p=5877832#p5877832
And here's two forks I've found from before then:
Feb 19 2014 - https://github.com/olilarkin/Obxd/tree/master/Source
Apr 13 2014 - https://github.com/orbitfold/Obxd/tree/master/Source