@Bird333, you’re going to an awful lot of unnecessary trouble to achieve nothing, because your more likely to do damage to one of your components, head, carts or both.
Firstly, just leave the carts as they are (With ink in them) and cap the outlet with the orange clips, that’s the carts part taken care of.
Now remove the head and leave it soaking in 2” of water for about a week, then rinse all of the head under tap water for several minutes, and if you don’t have soft water that’s ok, it won’t do any harm at this point.
If you don’t have soft water, then after rinsing, soak the head again for 15 minutes in distilled water, now remove the head and give it a vigorous shaking to remove most of the water and leave to dry for several hours at room temperature.
Lastly using pharmacists’ solution of propylene Glycol, Alcohol and distilled water, 10%, 30% and 60% and dribble some of that solution onto the ink inlets, don’t be afraid to use plenty, leave the head to stand for a couple of minutes then seal the head in a plastic bag and store.
When you ready to print again just put the head back into the printer along with the cartridges and your good to go, you can if you wish top up any of the carts before you start, but don’t forget to reset the chips first...
After a few years with printers....you learn there are no failsafes. Something always can happen it it want to.