I've compiled a few abilities from GLoG classes published in the past few years, scavenging some of the features that really go hard or were in some way neat to me. They seem to me to have the opportunity to get a second life as a one-off reward, magic item, or skill learned from a mentor in games that don't already happen to feature that class. Since there are so many GLoG classes out there and so few can be used in a single campaign, this could be a good way to recycle them, make them useful, and appreciate them.
You may have to do a bit of adaption but I trust you. Every output is a link to the original page and author.