I’m sure that being in the NHS has a significant meaning to you (and congratulations on achieving the academic side of that, which in my mind, aside from any ethical concerns, is the most important, and the only one that matters worth a damn), so you probably don’t want to jeopardize that.
But if I were you I’d give serious consideration – as a form of community service – to strongly protesting the mandatory community service “volunteer” aspect of the Society. Reminding people of the precepts of our body politic cannot be done too often these days, and is not done well at all.
Don’t get me wrong; I have nothing against volunteering for community service, either formally or informally. I’ve done and continue to do both, and it’s commendable in anyone. But to make “community service” a mandatory aspect of something that doesn’t have that as a basis seems to demean it – and the person who is required to “volunteer” it – in my eyes.
An actual community service that you might also consider is to work alongside juvenile and other young offenders who have been sentenced to “community service” as a substitute for jail or fines or both and just tell them jokes (or even better, I suppose, just listen to their stories) to make their own sentences pass more pleasantly and seem to pass more quickly. (In fact, for someone such as yourself to befriend and mentor one or two like that would be a direct and very noble service indeed with a potentially long-lived payoff. No joke at all, that.) I wouldn’t even for a second consider that their “bad ways” would influence you.