Yeah, but getting there is the hard part...
Right, but as you probably know, Russian military officers are divided on those who are reluctant warriors and those who are belligerent dumbasses, depending on, first of all, service and educational background. AAW defence forces - the main user of SA-20 and other land-based SAMs - in Soviet time was a separate service, akin to USMC administratively, having consisted, in turn, of two parts: an interseptor forces and SAM forces. If you are ready to be amazed by something unbelivable, there you go: the former, headed by the fighter pilots, were and still are the most thug-like gang very blood-thirsty to get an aerial kill. The latters, having mostly solid electro engineering or general math/physics education amalgamated in military training for five years, were/are very sceptical in things like leadership, patriotism, homeland and alike, but more concerned by the calculations how to place a missile onto target and the worse the circumstances are, the better - kinda sport, like soccer or golf. You can find an unprecedented amount of retired SAM officers in a fanfic writing crowd, showbizz, local rock bands, half-legal border firms trading with smugglers and so on. Creative people, free from the military ethos at all.
So if you can switch to 121,5 or 243 and tell those of them on duty something curious and funny, they'd probably decide you are smart enough to stay alive and make a mutually useful relationships, which is more important to them than some military victories;-)
BTW, a navalized SA-20, SAM Fort, is the most unreliable thing I have ever heard of. Not the missiles or VLS which are essentially equal to the land variants, but the fire control radar, which is totally different from the landbased version and absolutely hostile to the personnell and maritime electricity's reality. Simple power supply's switch between generators could knock it out for days. An endless pain in the ass of the Missile-Artillery DH of the cruisers. Maybe naval version of S-400 will be better, time will show.