Well, that's what we know now. France was winner of WWI and everybody sent it's officers to schools over there.It seems to me the best way to improve the Romanian military is to make an alliance with the Germans and Italians earlier. This way they'll be no interference with procurement of weapons from the Czechs or Belgium. They can maybe get a better deal on Sm79 bombers from Italy. They can also send army officers and pilots to train in Germany to improve leadership skills and tactical doctrine. Perhaps also sending their own version of the Condor Legion to SCW for combat experiance and forming a stronger bond with their Axis partners would improve their situation as well.
What would help in my opinion is pushing Czech companies to manufacture in Romania. Skoda gun works, maybe CKD tractor and tank manufacturing with above mentioned Malaxa factory (but there Czechoslovakia had issue with espionage for Germany I believe). Maybe Tatra truck manufacturing in Romania or French Fiat trucks.
Romanians built around 1500 Ford trucks from parts imported from US, but after war started this was over.
Romanians also built Soviet 120 mm mortars which were also copied by Germany.