We wrote a script to load in fmriprep outputs and then run single trial GLMs using SPM. We are wondering if it would be worthwhile to integrate our code with your BIDS App (i.e. using spm_BIDS as the data loader, and providing the single-trial GLM script as an example of a configuration file). We weren't too sure if this repo is still active, so if you're interested then let us know!