I started the Beckon a while back, have never finished it and dont plan to touch it in a while. It's still in the game and accesible, just not choosable without the commands. If you want to mess around with it, run the following command:

/origin set @s origins:origin srp_origins:nexus/beckon/stage1

Some of the systems are staying, and will probably be similar, but right now they're all very finnicky. For one, it was the first origin with a Biomass bar, which is what I based the Biomass the rest of the origins have off of. That for one is very outdated, lol. Feel free to give feedback, I plan to have Beckon Stage 3s have the choice to evolve to a Pure instead of a Stage 4, so I don't want it to be annoying or unplayable.