I feel like donating to any of those kinds of things will put you on a list. America being so divided means they will never really have the power to change the constitution in the near future.
I don't think these groups are trying to change the Constitution though (are they really?) I think they are just trying to uphold it, as in, keep what the people already should have.
Also, if the government tries to put their members on a watch-list, it will reflect badly on it because it would sound very coercive. Supporting the 2A should not get one on a list, imo