I have imaged with a Bresser 152 f5 Achro (with a rear petzval corrector) for several years. Strictly narrowband but it works very well. The thing about achros is that you will need an image capable focuser. I would not suggest trying broadband, unless you want to try a very long focal length which reduces CA considetably - however, long focal lengths means long sub times, good guiding, etc.
https://www.astrobin.com/275791/