the particular synths i am using (sts-24, laserblade – maybe other synthedit synths i dunno?) seem to only allow changing preset via the host
In that case it is best to convert the bank library preset to individual program library presets. Once you have assigned the bank preset to the plugin track, use the ‘create library presets for all programs’ track context menu. Once you have done this you can dispose of the bank preset, and assign the individual program presets in the preset panel.