is there any spell ,feat or item that let's u maintains a fast concentration or gives u a quick concentration ??
The only one that comes to my mind is the spell lvl 9 divide mind
https://www.aonprd.com/SpellDisplay.aspx?ItemName=Divide%20Mind
a gnome with this feat can maintain concentration on illusion spells, that depend on concentration for duration, as a swift action (can be taken even at level 1).