First time 7DRL-er here - been wanting to do this for a long time and looking forward to taking part :)

I don't use Reddit, Discord, or the RogueTemple forums, and I'm not keen on adding any new social media distractions to my already-daunted focus - but I also want to share my progress and participate actively. Would it be weird to share a daily update in a thread here?

I don't think it would. It could be like a development journal you'll be keeping.

Yes, this is a good place to share your progress.