You can partition the LLFPs into special irradiation targets and transmute them to short-lived things if you really want to, also in fast reactors.

I'm still a bigger fan of stable geologic disposal.

https://www.iaea.org/publications/7112/implications-of-parti...

No one has done that. It's not clear it can be done reasonably or economically. You'd have to isotopically separate the LLFPs from stable isotopes of the same elements.

I will say that if those LLFP can be separated, it's probably simpler and cheaper to just shoot them into space for disposal.

Still, much less to bury, and the resulting waste is much less active.