Transcending Concepts seems pretty good

Would multipresence allow me to alter the abilities of the different versions of myself?

Sure

To what extent? Because depending on that, it could certainly change what I'd go for.

I forgot what levels is in the superpower wiki, but I used vs battle wiki to give an example, you can only scale and give powers that relatively around 3-A: Universe level.

Ok. I think what I'd go for really comes down to whether being Conceptually Transcendent would render my personality and human nature void. Transcending concepts and (possibly) meta-concepts would essentially entail Nigh-Absolute Transcendence, above everything except absolutes, but I wouldn't want it if it actually makes me... not me, if that makes sense. I feel 'transcendence' would tend to imply I am superior to concepts, so I am independent of them and do not require them to be as I am, thus retaining everything that I am unless I choose to change it. I don't know, what do you think?

Deep analysis, nice job

I agree with your thought process, changing yourself mentally would mean your not the same person, yes change can mean something else, like a better version but also completely different or worse. I think go for powers you can control that wouldn't alter you, but that's my take on things.

I'm more on that you transcend Concepts and are no longer bound by them