TO BE "QUR-AN ONLY", MEANS NO RITUAL PRAYER..
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Salaamun
To be a Qur-an Only advocate and then uphold the notion that a ritual prayer is required, is a contradiction.
If, we, as Muslims, agree that Allah means what He says, then when He says His Book/Al-Qur-an, is complete, fully detailed, and omits nothing, then we know that He means this. This being the case then, if a ritual prayer were required, He would have had to give us the details for doing it. While I agree some verses appear to suggest a ritual prayer is to done, I'm certain that this is the result of either a poor translation of the verse or us not fully understanding verse or both.
Bottomline though, we know that there is no ritual prayer, because Allah did not give us any details on how to perform a raka from beginning to end. Based on this evidence alone the ritual prayer should be abandoned, because Allah has forbidden us to follow/ do that which we have no knowledge of, hence, to conjecture/extrapolate.