According to a music-loving friend of mine that has modern in-the-ear hearing aids - they sound very natural.
(Audiophile quality is usually something sounding far from natural...)
Top of the line hearing aid technology is pretty amazing these days. The drivers and DSP have come a long way.
If you contemplate using an audiogram to modify speaker response curves you also need to consider whether your hearing loss is impacting your quality of life. Modern hearing aids allow you to select different correction modes for different circumstances, like quiet rooms vs noisy restaurants. Most modes emphasize speech comprehension and exaggerate frequencies where vocal formants help distinguish a B from a D from a V. One of the settings will be for music listening, with flat response as corrected after your audiogram. Of course, if this is a case of audiophillia nervosa where someone is tweaking 2dB here and 5dB there, hearing aids aren't relevant, but if someone is adjusting for the audiograms in the first post they are quite relevant. The one on the right is quite similar to mine.
Who cares?
REAL hearing loss is GROSS, anything that compensate it, even if partly, is fine.
Not the place to worry about "audiophile" myths.
If anyting, the solution is to make a good hearing aid, which is entirely possible.
As of the original question: no, tweaking crossovers is NOT the ay to go, for the very good reason that crossovers are passive.
They add nothing, can only attenuate "everything else".
So to compensate for a mild, say, 10dB loss@10kHz, you eto attenuate everything below that by 10dB .... clearly not a practical solution.
Worse if more compensation is needed.
The proper solution is to EQ/boost driving signal as needed.
It will demand more from the amplifier, of course, but power at the highest frequencies is not much, so you have more available headroom to use.
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