The flight test guide does permit up to 5 degrees bank angle for use during performance testing
I think we need to isolate the Vmc handling and optimum climb situations for the benefit of those coming up the training pipeline. There is a great deal of misinformation and ignorance in the GA fraternity, especially.
if the aircraft is equipped with spoilers
Of course OEM AFM guidance is observed. However, unless spoiler operation commences with a very small wheel deflection, this won't necessarily be a problem. In any case, as zzuf observes, swept wing often favours something in the region of wheel level. If I recall from my Boeing days, spoilers came in at around 10 degrees wheel deflection ?
I'll leave the finer detail explanations to the certification TPs on the site, such as zzuf. (I am presuming you have a TP background but your profile provides no guidance as to what your specific background might be ? If my guess be correct, you may well know zzuf).