S2 files to polarimetric products

Hi everyone,
I have proprietary SAR images in S2 format (There is no metadata in a compatible format).
Is there a way to create polarimetric decompositions in 4-bytes per channel decomposition?
I’m turning away from PolSarPro because there seems no way to generate other than an 8bit per channel bit-map (.BMP files).

I’ve loaded the files using File → import → SAR Formats → Generic Complex and it loads just fine (as far as I can tell by displaying one of the bands).
When I try to generate polarimetric products using Radar → Polarimetric → Polarimetric Decomposition, There is only one ‘source product’ drop-down.

How can I load all the channels in a way that compatible with polarimetric product generation?