Changing the custom of forgiveness

Hello Rabbi,
As Elul approaches: I am Sephardic, to what extent do the wording and custom of starting to say Selichot at the beginning of the month of Elul obligate me?
I feel the need to change the wording (for example, that of Tzohar), and start saying Selichot as the Ashkenazi custom (the minimum practiced by all of Israel) because this custom is tedious and long (at least in the Sephardic form) and I don’t really find the religious and halakhic point. I don’t think that by reciting piyyutim anything changes in God’s mind.
Of course, God forgives and in order for Him to forgive we must ask, but I find it hard to believe that this happens by mumbling any poetic words (I should point out that I also think this way in prayer, and therefore there too I skip the parts that are more like poetry, at least there is no formal obligation. So in the case of forgiveness, there is nothing formal about them, at least to the best of my knowledge).
I do believe that part of this is also supposed to create a process of repentance in the person themselves, but I can testify for myself that this is not the cause, but rather the confession and prayers of Rosh Hashanah and Yom Kippur.
Is there in any way a formal side to remaining as per ancestral custom? Is there something I’m missing here in my thinking?
thanks.