I bought one of these Micro-Dehumidifier modules earlier this year I’ve been meaning to use in a dry-box I need to finish (got busy, forgot about it). Allegedly solid results without the need for desiccant and there’s an AMS mounting solution. They’re pricey but might be something to look at.
Second hand though would help, wouldn’t be surprised if we see a bunch of mk3s and maybe even some mk4 with their new printer coming out. I still use my mk3s pretty frequently, made a bunch of mods to it, still chugs along.