I understand and sympathise with your frustrations. The beekeeping learning curve is a steep one where personal unexpected turns can trigger a sense of overwhelm. Particularly in light of unusual circumstances such as a lockdown.
Flow intends to support our newbees across the globe as best we can, with online resources such as thebeekeeper.org, support site, weekly Q&A Facebook Live which does include info on what type of hive the Flow Hive is compatible with. We also have our Flow Ambassador program that offers local support and we have one in Roma, Italy, that I’d love to put you in touch with. His name is Giuseppe Mongelli and email - email@example.com. Giuseppe may be able to help you with your best options for setting up a colony and beekeeping in your local area.
As a beginner, it’s so incredible important that local and experienced advice is sought out in order to understand the typical beekeeping practices in your unique region and climate, which the health and wellbeing of your bees depend on. This includes typical equipment, practices such as wintering, pest and disease management.
There are actually multiple options for you to source your bees without the need to modify anything, e.g. waiting for a package to become available (patiently waiting for the seasons is a common facet of beekeeping), catching a swarm, bait hive.
If you would like to acquire bees immediately and your only option is a nuc, then this is where modifying frames or sourcing a Dadant brood box are your best options.
I wish you all the best navigating this new world in such difficult times and that the forum community can offer some comfort and support.