I found a couple options that appear to have bigger buttons:
1. Dark, not sure if buttons will be big enough: https://www.deviantart.com/maverick0...malX-385698882
2. Not dark, buttons look plenty big: https://www.deviantart.com/beowulf0/...skin-672766796
If you don't like those, it looks like there are quite a few skins available (ex: I see deviantart.com has a VLC skin category
). There's also a high dpi Windows hack available for VLC, but I'd only do that as a last resort (some people mentioned it lowering playback resolution).
I'd think the skins are cross platform, so should work on any operating system. The above 2 skins look good (esp. MinimalX) but I can't vouch for them. I've been meaning to try a better skin for quite awhile, preferably one such as you're looking for, dark with a larger UI, but haven't got around to it. Lately I've been using Parole (on Linux) while I procrastinate getting Kodi set up. It's much nicer to use, but probably missing some features vs VLC.
Anyway, let me know how you make out.