Those phrases are so vague it would be hard to prove they are reasonably only associated with PA, not to mention that they predate Palestine Action even existing
This is simply not true. You could be jailed for openly and publicly supporting Palestine Action specifically, but you can support Palestine and speak out about genocide as much as you like.
I can appreciate the sentiment, but I will say that here in the UK (and other places in Europe), we have a Remembrance Day which honours all the dead of war, civilians and service personnel included, so it can be done. Anecdotal, but personally I've never met someone who has served that resents it not just being about those who served.
Those phrases are so vague it would be hard to prove they are reasonably only associated with PA, not to mention that they predate Palestine Action even existing