Ok, while I was writing the last comment I came across a thought about how you can “abuse” the new injectors. Although only once per month.
If you only PLEX for a month and your sub runs out, immediately after you go alpha you use an injector and then go Omega again. This way you get the full day of Omega training as well as the 50k SP from the injector. Nothing game breaking, but given the ridiculous diminishing returns of regular injectors certainly worth a thought.