The cassette style is pretty new, and bidets are pretty rare here. There was a thread a few days ago...but I'm not sure how it compares between models. Here is a search for all mentions of the word "bidet" here in Forum land;
Agree with Dale, in a 320 with a cassette, I’d be concerned about both fresh water use and especially waste water use.
I doubt a seat-type bidet could be easily fitted to a cassette toilet. A few people have installed the hose type inline on both the 400 and older 320 showers, so you could look closer at those installs and see if you can do similar with the plumbing of the new above-toilet sink/shower. Or you can always use a portable bidet bottle—easy, cheap, and uses less water than most sprayers.
2019 320s BD Lite, white with blue (“Haven”) 2015 Subaru Outback 3.6r (unsafe 200lb tongue weight limit until 2020 models) 2020 Subaru Outback XT Pacific NW
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2015 Subaru Outback 3.6r (unsafe 200lb tongue weight limit until 2020 models)
2020 Subaru Outback XT
Pacific NW