Thank you for taking the time to answer my question as well as woodlanding request, and explaining in detais why it might not happen, the case I was thinking about was more "everything's wiped 20min before the show and I have to rebuild my env from github over telephone line-ish bandwidth" than update. I totally understand why it will certainly no happen, that would indeed create more issues than the few particular usecase it address.
It's most likely against the EULA, but for my own need, will certainly repack and host a "core" version of the last version I used in rehearsal before going to the venue, that would solve my fears in the end.
The script I'm using is just parsing http://www.brainmodular.com/downloads/_HHx_/, checking what's locally installed, and if newer version or requested by the user, download the zip, unzip it then import from the previous env. I rely heavily on source control and my previous install is never touched. I totally agree it's really straight forward and in the end, most of the issues I have are related to how WSL2 handle filesystem (basically, it's over the network... yikes... kind of unziping over smb...)

That said, I would like to emphasize few points, that might make the devs "happy" regarding previously mentioned points (or at least, as an ex-dev, if a client would have said that about product I was working on, that would have make my day):
- I'm never scared to update, as opposed to tons of other softwares.
- barely never had breaking changes, even when having to update over few release in a row after a pause on a project, and even then, it was mostly related to me doing "borderline" stuffs.
- I'm thrilled everytime I see an update (not lying, happy everytime I'm not time constrained)
- I'm reading with excitement the changelogs

What you're building is truly amazing and kind of unique and I was kind of asking for even more icing on top the already delicious cake.

post TLDR:
"So, is there a "resource-less"/minimal/core packaging of hh5 somewhere? If not, is it something I might have the joy to see one day?" - nope, and don't expect it.

Best regards
Emmanuel