UIV I'm a bit baffled - why would a glide approach cause any of the difficulties you quote?
You might be a little higher at the start but given the variability of apporaches I doubt anyone would notice.
You fly pretty much the same speed so how is 'fitting in' a problem?
As for plummeting? Are you a newspaper reporter? Do you treat your engine that way? Cos I certainly never do.
What do I achieve by doing them? I improve my aircraft handling skills, I give myself many more options if the engine every does fail, I maintain a level of currency in terms of judgement which flying an engine assisted PAPI apporach does not exist - actually I have fun too!