Calibre Content Server / Bookorbit / Personal OPDS & Tailscale

Okay, so I have Tailscale setup and Calibre running the content server and when I'm using a device I can run the Tailscale client one (my iPad, laptop, my jailbroken Kindle with KOreader) it's butter and works exactly as I'd like it to. This is great! Unfortunately, I have a few devices (xteink and a few other older e-readers) which cannot run a Tailscale client. While I /can/ connect them to my phone as a hotspot with it running Tailscale and it works, that sort of defeats the ease of use. Mayberry OPDS is out there and is great, too, but because of how it does some stuff in the background, is hit or miss on a few of these devices. I setup port forwarding with my eero router and it works just fine, but that feels really exposed for potential exploitation folks. SO what I'm wondering (and I will need this explained like I'm a luddite / step-by-step because I've searched and just gone cross-eyed trying to figure out) is if there is a way to leverage the awesomeness of Tailscale to make my home computer (which is on 24/7, hosts Calibre and Bookorbit and is running a Tailscale client) remotely accessible w/out just setting up port forwarding on my eero router and leaving the whole machine WAY too accessible? Ultimately, this isn't just a Calibre / Bookorbit / etc. thing, since I think this would fundamentally be the same for any other sort of self-hosting, but I've not gone down that rabbit hole for anything other than my books / manga / comics yet. I appreciate any help folks can provide here.