I know I'm nit picking here but there is too much damn pseudo science that gets thrown around by people talking about audio that it is a pet peeve of mine.
It sounds like you know just enough sound theory to use the right buzz words in the right places without having a full understanding of what they actually mean.
Aliasing isn't an issue as you approach the nyquist frequency, it is an issue when you pass it.
Using a low pass filter just below the nyquist frequency wouldn't "affect the harmonics" it would remove harmonics above the cut-off frequency. The fundamental and lower harmonics would be just fine.
Whether those high frequency harmonics would actually affect the timbre of the sound in an audible way is an entirely different question...one which I can find conflicting studies on. Either way your speakers aren't going to be able to reproduce those high frequency harmonics anyway so the whole issue is moot.