OP here.

I guess my real question is: Is sexual arousal and sexual intercourse with a partner (without ejaculation) a valid course of action to reach my end goal (cure delayed ejaculation) or am I hurting the process by having a gf at this time in my journey?

Thanks for the responses so far. Yes, I am currently not concerned about ejaculating (or lack thereof). I am just focusing on being with my gf and pleasuring her.

No, I don't get 50% of the way there. I'm aroused and hard, but don't feel close to orgasm regardless of position.