The community around the newsletter is still pretty active on slack, right? Why not queue up a bunch of guest posts from that group, and accept submissions for guest posts from subscribers?
(This might mean keeping the patreon paused — after all, it wouldn’t be you writing each email.)
I would certainly be willing to write a few if you did this. And, you could probably do it that way indefinitely. If you got the impulse to write your own, you could just inject it into the queue like anything else.
The work would come down to making sure submissions are on topic, which is easier than actually writing them.