When a verse is to long ( and the fontsize gets to small) we divide the verse into 2 (or more) parts with a new line.
When saving the song a tag with "Verse 2" appears. But this is still the first verse. Can you add some kind of tag to indicate the start of a new slide without changing the verse order or size ? Some kind of divider of some sort.
The first method you showed is actually how we do it at our church. Regarding your test:
If you have multiple verse 1 then the second time you click the 1 shortcut it will jump to the 2nd instants of verse 1 then the 3rd instant of verse 1. This method make sense for us but I could see how a new slide tag could help too.