No, "more willing" is two words. If your question is whether it's usable in a sentence, then yes, it is, since willingness can be quantified.
more willing
Willing, more willing, most willing.I am willing to help you.Barbara is more willing to help you.Fiona is most willing to help you.
Desperate is the word that means willing to do anything.
The word that means willing to learn is "curious."
I am quite willing to answer this question.
There are two syllables. Wil-ling.
The base word for "wilful" is "will."
Wishing; willing.
The superlative for willing would be "most willing." There is no one-word superlative.
Explaining the complexity of the entire process would have involved more time than I was willing to invest.
resisting; unwilling
Obeying