I know the LTA HA products are integrated but I wonder if I could go with separates to find a new role for my MicroZotl.
I don’t understand this statement. Your LTA is an excellent headphone amp and you’d only need to add a source and headphones and you’d be good to go. Most people use integrated headphone amps rather than separates in dedicated headphone systems, and if you give an idea of what sound characteristics you’re looking for and budget you’ll get some good recommendations here to help get you started.