More than one path to a clean wing........
Typical pilot personalities gravitate to ONE answer, ONE CORRECT WAY; black/white right/wrong. The NG is flown by different crews in different ways all over the globe every minute of the day. Just ask the __________ (you fill in the nationality or airline) and they will tell you that they are the BEST.
In your original question you mentioned being in the NG sim. In a training environment the RIGHT answer is what the instructor evaluating/training says that it is (under most cases). Presumably based on whatever the company procedures are at that time.
Our polity is to verify a valid roll mode at 500’ (LNAV, HDG SEL – whatever) then at 1,000’ AGL we start accelerating and changing configuration. So, no (in our case) we would not be retracting flaps based on V2+15 regardless of altitude. For us being at the appropriate speed and altitude will come first (they are closely related) then we would be retracting flaps, rather than calling for flap retraction the moment V2+15 is achieved.
Certainly you are free to post your question here or anywhere else. This answer is going to be airline specific; I would ask the instructor that is training/evaluating you.