torepr didn't quite work for me as I was dealing with objects containing large binary blobs and it was awkward.
fq is a great tool and I shouldn't have suggested this was a problem unique to it! I think this kind of "issue" is inevitable when dealing with so many types of input. And to be honest I struggle hard using jq as well for anything other than very basic paths, due to infrequent usage.
About blobs, if you want to change how (possibly large) binaries are represented as JSON you can use the bits_format options, see https://github.com/wader/fq/blob/master/doc/usage.md#options, so fq -o bits_format=md5 torepr ...
I can highly recommend to learn jq, it's what makes fq really useful, and as a bonus you will learn jq in general! :)