Hey there, I know this workaround I’m going to suggest is not a solution for your problem, but it might speed up your current one:
I have myself a “LoFi-project” as a starting point / template, where for the first half of the sample slots I already populated those with the same short sample. They all have a reduced bit-depth (12 for me) and overdrive on 1, because I like the result. When you load a new sample over one of those instrument sample slots, they already have those settings applied. (I also have some other ADSR start settings applied, e.g. no release etc.) When you import with the low quality setting as well you will get a 22kHz version imported.
To stop my own confusion I renamed the sample to “empty” before copying it to the other slots so I know which ones I actually want to use and which ones are just placeholders. This took me about three minutes to set up, but I think it was worthwhile, to reduce those little frictions when starting fresh 
I know this isn’t the same as an SP-12 - type lofi sound, but at least you are safe from setting this up every effing time 
