HAAT P1 solo, no escapes & no ABC use??

One of the biggest problems with not using CLS on a P1 team is the need for Tenacity Down. A Brotini team only works so incredibly well because of CLS' TD on special. He's the only TMR character that inflicts it, so you'll need to bring someone else along or put up with either a need for ridiculous amounts of Potency or a ton of resisted TMR attempts.

My own vote would be a really fast Jyn. Her special has a 2-turn cooldown, she grants advantage to allies, and steals the removed TM for herself, in effect reducing her time between TMR. And her unique grants her stacking Potency if you ignored paragraph 1.