I own the Canon Pro 1000.
Short answer: Don't buy the printer for this scenario. Use a printing service instead.
The Canon is designed to be frequently used. It uses pigmented ink which don't take long periods of not being used too well. It even shakes the cartridges before each print run. If the printer is kept plugged in, it will clean itself from time to time. These cleaning cycles use a good amount of ink and you have a good chance of wasting a full set of cartridges during these cleaning cycles into the waste ink tank if you let it do multiple deep cleaning cycles. That is about $500 in inks.
The printer is kept from doing deep cleaning cycles if you print at least one sheet every 48 hrs. I usually keep some cheap 4x6 paper in the feeder and at least print a small print every other day.
I also currently play around with a raspberry pi mini-computer to automate that. So that I can dump images into a network drive and the mini-computer takes one each day and prints it. That would be about 50 cents used in ink and paper vs ink wasted in cleaning cycles.
If you detach the printer from power for a long time (several months), you have a good chance of the inks clogging and destroying the print-head beyond repair by automated cleaning cycles.
So if you don't have a scenario of frequently using the printer, I cannot recommend it.