Hard-set Orbi Channel Width

Hey everyone, I want to manually restrict Orbi's 2.4 and 5 GHz broadcasts to 20 MHz wide for selected center channels.

I am aware of the default "Enable 20/40 MHz co-existance" option for the 2.4 GHz band, however, I understand this feature only allows automatic downshifting from 40 MHz to 20 MHz (if it senses another signal operating near it's broadcast frequency). I am unaware of any method to restrict the 2.4 GHz broadcast's channel width to 20 MHz only.

Also, it appears others are saying Orbi, by default, tries to automatically select up to 80 MHz channel width on the 5 GHz front and back haul bands (5.2 and 5.8 GHz, respectfully), depending on what it senses during its scans. Supposedly this is to allow maximum throughput to end-users.

Does anyone know if the Orbi firmware supports hard-setting specific channel widths (say, via CLI?). Last I checked, the GUI interface on the latest firmware versions don't allow this on AX models, RBR50's,40's, 20's, etc.

If anyone can provide a definitive answer, I'd be grateful. 

Best, 

Isaac

Side note: I work for a WISP, so this is an important factor in keeping my company's wireless backbone free from RF interference up to the demarcation point.