Synchthing definitely needs some tweaking until it works the way you want it.
I've been using it for the psst five years and I'm pretty happy with it today. I have several folders synched between two servers and a handful of devices, including my Android phone. It has completely replaced Dropbox for me.
Except for a cheap stand I bought on Amazon, I don't use any accessories. My steam deck is either docked to my monitor or used in handheld mode. When docked, I use it mostly in desktop mode with mouse and keyboard. I use the same setup with my laptop from work when I work from home.
I just started Mass Effect Legendary Edition a few weeks ago on steamdeck. I'm somewhere in ME2 currently and really enjoying it. I played the original ME back in the day but never finished it. This time I plan to finish the whole trilogy.
I forgot the first one, but I remember I upgraded it to an ATi Rage Pro so I could play Baldur's Gate, which needed 8 megabytes of video ram. Later I paired it with a Voodoo 2. I think it was the Diamond Monster one. And that one got replaced with a Matrox G200, which got replaced with Kyro II. I picked some odd cards back then.
I remember watching Totoro as a child not knowing it was an anime. Later I watched The Guyver (1989 OVA) on VHS at my cousin's. Evangelion and Lodoss War were the first fansubs I watched knowing they were Japanese.
I guess you could remap them in desktop mode? I haven't tried but it should be possible.