Live together as in:
- we are taking over one of the main ports on your coast
Nope, the proposal was that the port remains free for Polish ships.
And Poland had already another port in Gdynia/Gdingen.
And Danzig was a German city anyway, the people there wanted nothing to do with Poland.
and in exchange
- you will allow for a country to be split in two by exterritorial highway and rail track
Well, Germany was split in two because of the unjust situation.
And that because of a territory for which Poland had no legitimate right whatsoever (except the "might makes right").
Polish police was harassing German travelers, therefore it had to be extraterritorial.
There is nothing special about that, for instance trains between West Berlin and Western Germany through East Germany were de-facto extraterritorial.
- you will fight ZSRR commies with us?
Not fight but be strong and prevent fight.
Hitler wanted a strong Poland to be a bulwark against "the Bolshevik masses".
Last time I checked after Beck's proposal issued in March 1939 there were no further negotiations.
Of course there weren't any, because Poland explicitly forbid it. Any mention of the topic by Germany would be treated by Poland as an act of war.
Unless of course Germany terminating in April the non-agression agreement from 1934 (and Fall Weiss) can be called "negotiations"... I'm sure in Walendy's mind it can.
The non-aggression agreement was de-facto terminated by Poland already (by acting aggressively). Hitler only spelled it out.