You will find few keyboards except Roland that do NOT cut the notes off when changing patches.

Another reason for the G70!

However, if there is ONE ES user at the church that is familiar with the Yamaha, perhaps he could write Setups into the ES that would accomplish what you need (except the patch change glitch). Then the non-technical player could simply call up the Setups that have been programmed for them? Give them easy to understand names, and place them in a Favorites section (has the ES got one of those?)...

Just a thought..