I get that. If you're going to buy a C9 and PA10, going to a Hugo2 might be a better idea if you like the Chord experience.Cayin C9 costs more than a Mojo 2 and PA10 combined! At most I'd consider adding a PA10 in chain with the Mojo2, don't think I'll be needing a C9
One thing to bear in mind with the PA10... whilst it has 3.5 and 4.4 inputs and outputs, you need to use the same in and out. You can't use a 3.5mm SE output from the Mojo2 to PA10, then 4.4mm output from PA10 to your IEM. One option would be to use a dual 3.5 male to single 4.4 male adapter from your Mojo2 to PA10, then use the 4.4 output from the amp. Or stick with a single-ended experience throughout, using adapters if needed.
There seems to be an almost endless stream of new products being launched so I'm sure there will be other options that pair well.