Is it disrespectful for an officer who was previously an NCO to recite the NCO creed with NCO while they recite it?

In my opinion, absolutely not. The NCO Creed should be a creed that is followed by every soldier regardless of rank. Take pride that you were once An NCO. A majority of the best officers I have known were prior enlisted. Do not forget where you come from sir.

I don’t believe it is disrespectful, if you review the words of the creed, although they are intended for service as an NCO, they are tenants of good leadership. You wore the stripes, you have every right to recite the creed as much a SPC on an E5 promotion board desiring the honor. As an officer, don’t hesitate to distinguish yourself from your peers. Rely on your experience. Most of us “mustangs” were motivated to become officers to see leadership done better. Not a desire to imitate the status quo. Your bond with the NCO corps (even through a creed) will make you a better officer.

I don't think it's disrespectful, but you should probably just allow the NCOs to have their time. You're an Officer now, and regardless of your past history, that's who you are. It's great that you are proud of your time in the NCO ranks and I'm sure it will be helpful in your new path, but perhaps it'd look better on you going forward to just recite it in your head next time.