WI: Poland accepts Romanian aid in September 1939?

In thinking about ideas for a possible entry into Map of the Fortnight 204 I ended up not making, I learned that Romania had offered military assistance to Poland when the Germans invaded, citing its alliance with Poland. What if Poland accepted military support from Romania in 1939? Does it declare war on Germany and the USSR? Does Romania find itself partitioned among cobelligerents in the war? What might be the broader consequences for the countries concerned and the wider world war? Discuss.
 
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