Getting fewer meds at any one time and different ones. But this was never for a real plan, but just that I might feel "impulsively" inclined.

It is one of the reasons for me not to use lithium (there are others).

I think it really think depends on how much you think it would really solve anything. For me it's just as with delusions or hallucinations: if they are kept in the "background", aren't things that truly scare you, make life impossible and/or aren't taunting you every minute or have the greatest of importance, it's fine. I guess it would therefore be not something fixed, what reaction you might get. I would hope not. Correctly judging this is one of the only important things.

A plan that scares you would be fine, I guess. Just don't let it crystallise into something you might find acceptable or even a good idea. Don't let it develop at all, if possible. Maybe make it into a game: how many plans can I come up with. Just so they don't get time to ripe. Paradoxical, but it might work. It is a form of desentisation.

If you aren't scared about the plan, but really and realistically scared you might give in I would go for 24/7 mildly (as in controlled release) strong sedation, if possible. Get rid of all non-sedating immediate-release pills. If you have too many sedatives (so really many) throw them away. The pharmacy will dispose of them for you.

Basically, all depends more on the state you're in, I'd say.