Good habit formation can't hurt, but don't neglect the fundamentals. The thing that's pulling your shoulders forward is not some mental weakness on your part, it's an imbalance in muscle tightness and weakness, like a tent pole with regular guy wires on one side and yarn on the other. You need exercises to strengthen the lower traps like floor Y's and chest supported dumbbell row, plus face pulls and scapular wall slide.

https://1h6wllf3f4qfut1832zlo21e-wpengine.netdna-ssl.com/wp-... (upper cross syndrome diagram)

https://www.t-nation.com/training/top-priority-for-lower-tra... (prone Y)

https://www.menshealth.com/fitness/a19521507/chest-supported... (chest supported dumbbell row)

https://www.t-nation.com/training/whats-your-weak-link (scapular wall slide)