Foobar2000. Haven’t found anything similar in terms of ui customization options, easy convert and ReplayGain operations built in.

I’ve been running Fedora with KDE on my Razer Blade 15 (2020 Advanced). Without knowing your specific hardware model I think you can run any reasonably popular distro and game happily.

Not equally myself, but you get used to doing things with the non-dominant hand surprisingly fast. Started using lefty mouse due to arm pain and maybe a week or two gets you to non-awkward basic usage.