I have successfully installed rasplex on the SD card.
Keyboard- Is there no way to finish the config without an actual wired keyboard? After having used and tossed many over the years its not like I have any more just lying around!
Remotes- I don't understand how or which device or which app to use. iphone, ipad, Remote Pi, RasPiConnect, via plex.app, plexmediaserver.app, plex for ios
I use a mini wireless keyboard for RasPlex. It works like a remote, but with the benefit of a keyboard and doesn't require any config either. There are plenty available, but the one I bought (and would thoroughly recommend) is this one (link to Amazon UK, price there is £19.99):