The right move would be to move to MODX Revo which is being supported and continuously developed by the MODX core team, no point in wasting your time working with Evo the longer you wait to switch the more you will have to learn.
I disagree, in fact I've just moved one of my Revo sites to Evo. When I decide to stop using Evo the chances are I would look for a different CMS than Revo. That's no disrespect to Revo which is superb.
No matter how good a fork version of Evo is, will it not be hampered by the old and often buggy Extras/Addons?