Harmonic exciters are not the best tool for restoring suppressed harmonics in recorded music. I use all-pass filters to time-align the suppressed harmonics with their associated fundamentals. This helps make the suppressed harmonics more audible.
When I turn to harmonic exciters, I use the ones in a plug-in from Voxengo called Gliss EQ. This is a parametric equalizer with an unlimited number of bands. It offers a choice of filter types. This includes harmonic exciter peaking filters that have a dynamic EQ option.