So Z3tA no longer supports MIDI patch change messages? Why in God's name would they remove support for that?
Bank/patch change was designed to be able to manage patches remotely using the MIDI standard.
For example you could use the MIDI change messages from a controller keyboard to a MIDI synth rack module to change patches.
I started using Cakewalk with external hardware synths, and the same advantages applied being able to set the patches in the external synth for a given MIDI project from the DAW sequencer. Cakewalk supported the bank/patch change to facilitate this use of external hardware.
Then along came soft synths. For a while, they mostly tried to follow the standards that had been in place for external hardware. MIDI bank/patch being the most common setup.
But what I have noticed these days, is that many of the modern soft synth developers are abandoning this legacy standard, and using a proprietary internal patch management and browser system baked into their VST UI.
One reason that the new way makes sense is that it does away with the 128 patch limit per bank, which is cool when you have a synth with 5000+ patches. You need a database approach if you are ever going to find what you need.
Another reason is that your VST synth settings are now saved with a DAW project, so that the last state of the patch with all your current tweaks gets saved with a project. You only need to save a patch now if you want to use it again later in another project.
The most optimal way to not have to send live bank/patch changes is to set up a track with a VSTi instance for every sound you are using in a project. Then just switch tracks to the sound you need. The advantages to this method would become apparent if you use large sample libraries. The time it would take to switch patches and load new multisamples could kill a live performance. The old hardware romplers typically used small compressed sample sets that loaded in an instant from a ROM chip.
I hope this helped shed some light on the subject. Bottom line is that it would appear that there really is no longer a patch management standard for soft synths.