I do understand your concern.
A wideband compressor won’t touch the frequency-balance, but its action will also be MUCH more audible. Multiband compressors, even just 3 or 4 bands, can do their job so much more without ever being objectionably audible.
Breakaway in 4-band mode is really extremely gentle — and Band 1 contains only sub-bass (x-over point around 36 Hz!) so all in all it’s more comparable to other manufacturers 3-band compressors in terms of spectral balancing, except it also handles the low bass separately. Other multiband compressors usually have the x-over point for the first band around 85 – 200 Hz.
It’s possible to do a Breakaway wideband preset, but trust me — I’ve tried it, and 4-band sounds SO much more natural, even on classical. I know, it’s counter-intuitive, but it really is true. 🙂
Best,
///Leif