Hi have a look at : using all inkts : purge.zip
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The file "purge.zip" from Inksupply.com includes files for printing 4, 6, 7, or 8 colors, as well as single colors by name, in case you have one nozzle with a persistent problem. For a 2200 you want to use the 7-color file to start (the 8-color I assume is for printers with both the MK and PK cartridges installed).
I have used this a few times and found it helpful. I probably wouldn't use it every day, since it uses up quite a bit of ink, but maybe once a week. You could also customize it in Photoshop (or any other image editor) to crop the color patches to a smaller size so they use less ink.
I am away from my Epson 2200 sometimes for three to six weeks, and I have only had minor clogginf problems when I use it again. My house has both temperature and humidity control, summer and winter, which probably helps.