Hi - what I’ve done before is to grab a good ‘same’ note as the one I need to correct from elsewhere in the performance; literally cut around it and copy it over the error. Not always easy or will work of course - and sometimes grabbing a whole (similar) phrase intact can be better, too… 
I’ve not tried VariAudio on bass, but give it a go on a small section - see if you can tweak it to acceptable quality; it is good/useful with vox (small changes)…
Bob