Yes, you can get the switch apart, but you must be patient and used to fine wiring jobs. And, you should own a set of electronics-grade small Torx tools. And not go into panic mode then suddenly a million little parts spill out (DAMHIK).
The ABS button is simply a cap on top of a rubber boot covering the actual switch. Kill switch rotates, but the principle is similar. The fact that these are jammed implies that the whole housing may be deformed, possibly not repairable.
You can try opening it, but I'd start looking at replacement parts; try Beemer Boneyar, Re-Psycle, eBay.