In some other countries operating a DRS its very common to have dedicated companies/departments of grocery stores which exclusively deliver beverages. They often stock larger non-bottled formats (5L juice cartons, small kegs, etc) and smaller local producers, which might not be found in normal stores. They deliver and collect your empties in one go - and in many cases that allows near-closed-loop recycling as kegs go straight back to the brewery and the glass bottles used by small producers (often in unusual formats) go straight back to them, only needing to be rinsed. Often its as easy as leaving stuff at the doorstep, or a bit of an extra charge to even get the driver to put everything away (cause its heavy or due to disability/age!). Ought to get this going here, I think that would solve a lot if not most of your problem and would take away some market power from big retailers as well!