Ported and sealed don't go well when you are looking at the FR below the tuning point of the ported speaker as the phase response begins to go all over the place. This is more of an issue when mixing subs without a HPF on the lowest frequencies. Mixing ported speakers with sealed subs is fine as you will be crossing over well above the likely tuning point of a speaker, and destructive interaction due to phase response is mitigated.
If this was an issue, then regardless of the sub type, no one would want to run bandpass speakers with a subwoofer as they would all have overlapping FR around the crossover, which would result in issues. Yet, many (most these days?) speakers are ported.
In other words, don't limit your speaker search to sealed speakers only just because you are using a sealed sub.
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