A preset with your vocal settings as a starting point seems like the only way to go. It´s far from optimal, IMHO.
I´m at home working on my presets, no point or desire to be locked up in my tiny rehearsing space for hours...
So say I get 10 prests done with vocal paths (using the template as a starting point). Now I´m ready to try it out with the band... It turns out that on "real use" the vocals are buried, too much reverb, or need more compression and high end... You have to change 3 blocks in 10 presets, so that´s a loooong time tweaking to get 1 path that´s basically shared among presets. If this happens at sound check at a venue (hey this space has already loads of natural reverb, need to loose some reverb on vocals), it´s panic time.
I own a VoiceLive 3, I´m in the process of switching to Helix for the superior sound, editing capabilities and routing options. I keep finding things that are missing in one or the other. Let me point out a feature in Voicelive3 that handle this specific scenario. Global preset... In every block in a preset there´s an option to revert to a "global setting", that is, the settings of that block in that global preset. So you got a "vocal + guitar" template that you configure as "global preset". Now you´re in preset 200 and Vocal comp is set to "use global", if you change the comp ratio it will change for every instance of a compression block that is set to "use global". Makes sense?. There´s other ways to achieve the same, but basically have the ability to configure a block´s "global settings" that are refernced in other instances.