On Fri, 8 Jun 2018 21:47:28 -0700 (PDT), wrote:

I want one with continuously variable IF bandwidth on the front.

With a DSP filter and demodulator, you can have exactly that. Spin
the shaft encoder knob, and the filter coeficients will change to
whatever you find useful. Not exactly what you want, but close:

ATR4255P
https://media.digikey.com/pdf/Data%20Sheets/Atmel%20PDFs/ATR4255P.pdf
For improved FM performance, an integrated IF filter with
adjustable bandwidth, a soft mute feature, and an automatic
multipath noise cancellation (MNC) circuit are fully integrated.
A powerful set of sensors is provided for receiving condition
analysis and stop signal generation.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558