1981 900SS switchgear

I’m currently restoring my 1981 900SS and I’ve found that the indicator switch, in the left-hand switch cluster, has seized and will not slide left or right. I have tried the usual methods, soaking it in release fluid for days, etc. but to no avail. The indicator switch can be removed from the cluster, so could be replaced, but these switch clusters seem all but unobtainable, now. I really want to retain the original, rather than replace with some generic offering. Any ideas, out there?