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I passed along your comments to my rabbi, and he emailed this back to me. I figure you might also find this of interest. As before, my rabbi's words are in blue text below.Thank you for that -- I asked a rabbi friend of mine and he tried to give me an answer based on what "everybody knows" but I boxed him into a rhetorical corner with my follow up questions so he went to look for sources.
The issue arises because I see people walk in late and some go all the way to their seats while others stop almost immediately and some move to a bit beyond the entrance so as not to block anything. But in some shuls, one gets to the men's section by walking behind the women's section. If a man were to walk in and stop, he would be praying on the female side of the mechitzah which he cannot do, so I wondered how far he can walk during kedusha. (Women walking behind/praying behind men has different rules so I constructed my hypothetical as applying to men) The followup questions about what to say (catchup, jump in or nothing) just came from the general idea of coming in late.
One quick note about the info you presented -- in the kedusha on Shabbat, there is often a lot of singing which would give someone time to catch up without missing the chance to say anything else further in the kedusha so I don't know if that changes anything.
Yes, the easiest thing is to lock the door, but I haven't seen that since I was a kid.