I have the J1s, and I want to know if I can use klipper firmware and accelerometers for my printer
The J1 works with Marlin.
I know, but could I flash klipper. Klipper allows for you to add accelerometers for active input ahaping
You might want to reach out to @Mechanikus as he has modified his J1 to work with a Duet, and as far as I know he’s the only mad lad in this forum who has done this.
@ZT_1234 If you just want to flash a firmware and be done, forget it. The J1 has a custom controller board which is not supported by Klipper unless this has changed in the last year since I looked last - which I would deem unlikely because Klipper does not really care for controllers built specifically for a single printer that is not too widespread.
In order to get the J1 to run another firmware, my state of knowledge is that you have to replace the controller with all the resulting consequences (i.e. make adapter cables, get the preamplifier for the hotend temp sensors and the unusual analogue filament sensors to run with your board, find a way to safely (!) implement the calibration sensing, replace the display), period.
Be warned: it is a lot of work, even if you can build upon the data that I had found out when I started that adventure. But I admit I am really happy with what I did to my J1 
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I guess I’ll consider it if I end up killing the main board by accident