That's part of the problem in reforming Islam - the fact that Islam teaches moslems submission w/out questioning. Or, at least, not negating its core tenets. Since the Koran (Quran) is viewed as immutable, the 'moderate' moslems tend to find ways around it, for example, by saying the violent parts are incorrectly interpreted. Or somehow rationalize/justify their existence, in certain circumstances.
I also think western pressure to reform can result in cosmetic changes only. Those moslems who live in the west (or some who live in moslem countries) & want to align themselves w/ western values, may do so because of political, social pressures rather than genuinely seeing & accepting that a need to reform the core tenets of Islam is required.
Btw, the Baha'i faith can very much be said to be one type of 'reformed Islam'. But, it is not recognized in any moslem country. Even as it clearly acknowledges & recognizes Allah, Mohammad as prophet & its original concepts were drawn from the Koran. Later, other religious sources were used to develop the faith. But, it also forbids its adherents from holding membership in any political party.
Perhaps a better method would be if fewer people were encouraged to practice Islam. Rather than only encouraging them to 'reform' Islam. In reality, the west, in recent centuries, has been an enabler of Islam.