Hindus are willing to make Muhamud one new Avataar. But will Muslims treat Hindus (or for that matter anything other than Islam) equally respectfully? Answer is no.
And there lies the rub:)-
Hindus treat all other faiths as equally true. Thus a Hindu could write on Kalki Avatar, similarities with Prophet(sic). However, Muslims don't accept anything other than Islam.
Naturally, Muslims will destroy these Hindus, their literature, or even Kalki Avataar if they wield power in India - as we seen in Bangladesh/Pakistan.