Thanks for the answers, just trying them out.

SC-IM looks good, except for some cells being full of ***********. I checked and the first one this happens on contains 186 characters so I think there's a limit? Shrinking the font didn't change what was displayed.

Python also looked hopeful but the example linked for straight CSV reading gives 'invalid syntax' although (conveniently) my CSV has exactly 3 columns so it should work. I got "No module named pandas" when trying to import that and the install guide says to use Anaconda to install it but that also doesn't appear to be available on Sailfish. Any pointers would be much appreciated