They are not intended to be a finished product, you are supposed to add your own display and keyboard. If you want really portable start with the Pi zero which doesn’t have the big ports, then slap on a small display and keyboard of your choice. There are small kits like these https://ameridroid.com/collections/all-products/products/odroid-go-advance for example. There are also a few different ones with blackberry keyboards https://liliputing.com/beepberry-is-a-79-hackable-pocket-computer-kit-with-a-blackberry-keyboard/ https://arstechnica.com/gadgets/2023/05/its-a-raspberry-pi-a-blackberry-keyboard-and-a-battery-its-the-beepberry/ (when blackberry quit making hardware they surplussed a bunch of keyboards)

https://ghostwriter.kde.org/ is decent

yep, use a free ddns service if you don’t want to pay