The French supply chain was crazy. With the US giving France some thing like 230,000+ M1 Garand rifles in the 50s alone.
Some units should be completely kited out with American equipment and uniforms. To the point units would request resupply and get ammo for the wrong countries arms!

The battalion was expanded into a 2 battalion regiment when it first arrived in Indo-chain before casualties and attrition forced the unit back down to one battalion before it was shipped to North Africa in 1955. So you could have units with American kit and weapons mixed in with unit fully kited out with French equipment and gear depending on the individual battles fought.
Also don't forget that after China joined the war in Korea, that the US decided to start arming the west again so many French metropolitan units in France and in north Africa where fully uniformed and equipped with US weapons. So the likely hood of a few M1s being kept by them is actually pretty good. but how long they would still have them after getting in country is the issue. For it would seem that most of the m1s gerands going to Indo china seemed to be put into the hand of the local French union troops who would later turn into the ARVAN.
I am not to sure on the American paras though. Photos from the Korean war seems to show the Airborne looking like regular GIs.
But that could be some interesting conversion with say some of the ww2 US Airborne with say M1/M2 carbines (M1 carbines especially the para version where very popular and a prized rifle) being painted up as French paras. I would think a French beret head or the soft caps along with the paras camo might integrate the minature nicely into your existing force.