Do I have anything in my roster that can beat SLKR

If you want to try an interim SLKR counter before you finish Luke, then you could farm the armorer. Jkr lead JKL armorer (other 2 don’t matter so much - you could use HODA plus AN Other Jedi). SLKR jumps JKR to trigger Armorers 3rd stack - whack the Beskar on JKL. Take ST out first & then JKL should work through the rest of the squad. I don’t have the fastest JKR so I find this a more reliable counter than the traditional Jedi one