And now it was me lagging to respond, sorry. Part of this is that I had to learn about ParSeq-8 myself. Luckily, a couple of tutorials have been published recently by Bitwish users. 
The title says 1 “Parseq modulators” but this is specifically about Parseq-8, correct?
I have found Bitwig Preset: Mutant Parseq and I wonder whether it is of any help in the meantime. Something that we can add to “Is there already an alternative way to achieve this on Bitwig?”, even if it would only cover part of this request.