I have an old MWBC and I'd like to protect the circuits with GFCI and CACFI (they are general purpose 15A circuits and include receptacles and lights). Note, currently they just have their own 15A breaker (no dual pole, no ties, no GFCI, no (C)AFCI etc.).
My understanding is that MWBC's require dual pole breakers. Unfortunately I am not able to find a dual pole, dual function breaker for my Siemens panel.
Is it allowed to just get two Q115DFN (dual function CAFCI/GFCI 15A) and bridge them via handle tie?
If not, what are other options (other than re-pulling neutral wires)?