I've been doing this with singe file html pages that bundle all dependencies inline, no server necessary. It does put some restrictions on what you can do, since local files are sandboxed pretty hard, but with all dependencies inlined (and with WebAssembly you can get pretty crazy, like embedding SQLite in an html file) you can do quite a lot.

Just the other week I made a little app that loads CSV files from a room booking system to create monthly reports, which was done manually by the sole employee of our housing association and took several hours – now it takes minutes.

It's been my go to way to create easily deployed rich GUI apps for the past year or so, and is pretty simple to build with a few shell scripts to put it all together. The resulting html files can be big, but they load really quite fast and since they're deployed on to a machine and not served over a network the size doesn't matter that much. It's also way less than an electron deployment anyway.