Have a look at https://distrobox.it/. It allows you to tightly integrate containers into your desktop, including accelerated graphics, some devices, your homedir, etc. It can even automatically install desktop shortcuts. (You can disable the integrations of course)
Furthermore, distrobox allows you to define the list of packages to be installed, see:
I believe the question is missing somehow the main points... even if the switch cost the double or triple there are several strategic advantages that should take into account:
use Linux allow to growth the number of high specialized professional workers, investing on local resources;
invest in a local network of specialized companies, instead of financing the silicon valley with ours public money;
be less dependent by abroad technologies, get a major control of the system used;
These are few that come to my mind...
What would be really interesting to know is the percentage of the investment that stay in the region/country following a linux-based/opensource IT infrastructure for public bodies vs the current closed M$|OSX paradigm.
I've used an old phone just for this task... ;-)