After some researching what I understand would be the alternatives for making this work:
Linuxsampler: requires some understanding of command line for configuring the libraries and apparently is not the most stable thing in the world. That understanding is beyond me, forever I think.
Carla: initially made use of Linuxsampler but now moved to SFzero, requires understanding of “Carla” xD one has to put the right folders in the right places I imagine. This I could give a try, but don’t know really where to start.
Sforzando: through wine one can open its standalone version and then call it up from Carla as an LV2 plugin inside Ardour. The whole wine thing I tried more than a decade ago when I first started using Linux, and it was for me as cumbersome solution as harmful to my system that I just gave up.
Sfizz: the most promising for what I can handle, has a LV2 plugin published and all: https://github.com/sfztools/sfizz/releases/tag/v0.2.0
I downloaded it and pasted the lv2 folder in my .lv2 folder, but nothing happens.
Redux from Renoise: it has a demo version that I haven’t tried yet as I would look for a more “free (as in cold refreshing beer) full working” thing.
I’d appreciate if some connoisseur could take my hand and walk me through the most hassle free way to make an SFZ soundfont work in Ardour, preferably without messing around too much with terminal, I feel comfortable with Synaptic and .deb packages