Frets have been levelled now and I've been giving the Gnosis a bit more of a go. I do need to get a new nut, as the one attached is set a little low, so I need to set the action a bit higher than I might like, not absurdly high though.
Other than that, it plays quite nicely now. I very much appreciate how light it is, on account of the basswood body, as well as the chunky neck. Tuners haven't given me any real grief so far and hold their tune totally fine, so not in any rush to swap them out, and same with the tune-o-matic bridge.
Pickups are the only thing that I have some quarrel with. The bridge pickup has a tendency to reeeally try and drive things, so even on pretty clean settings it has a tendency to break up a little. I have found that without fairly neat and tidy distortion, chords and powerchords down the lower end (which is not THAT low, I'm only tuned half a step down) find themselves being a little muddy and bassy. Both of these issues are not drastic, and they can be worked around, but I've found that the pickups are just overall a bit picky about the settings they're being put through. So after all, they will be the second thing to replace, after the nut, which is a more pressing issue