It's no trouble. Printers are sort of my hobby horse, so it's no trouble getting me to talk about the topic. Careful about getting me started though...
Ok, first of all, the 2200. I don't have that printer, so I can't of course say with a complete certainty that the Inkowl cartridges will work. I have refillable cartridges from Inkowl (and other sources) for my 7720, and they work great. I also know the type of chip that the 2200 uses, and there is no reason why aftermarket cartridges shouldn't work with it. I can't say why alternate cartridges didn't work for you before, except to say that often early versions automatic reset chips used in aftermarket cartridges don't always work 100%, and that Epson aggressively targets aftermarket cartridges when they do printer firmware updates. I can also tell you the folks at Inkowl have been pretty professional and honest in my experience, so if you write them and ask them what the current status is of their refillable Epson Stylus 2200 cartridges, they will let you know if the chip on them is being recognized by current Epson firmwares. Also, aftermarket refillable cartridges need to be properly primed before their first use, and if that's not done then it can be quite a trick to get them to work right. It's not hard to do, but some cartridge resellers don't tell you this factoid, so if it was refillable cartridges you tried before, this may be one reason you experienced troubles.
Now, the Epson WF-7720. I love this printer, but no, it's not really that portable. It's pretty big, since it is a wide-format (13x19) all-on-one printer. It has a duplexijng auto-document-feeder scanner (plus a large scanning platform), it supports duplex printing, borderless all the way up to 13x19, has two paper trays and a rear feeder and all that adds size and weight. But on the plus side this printer uses the Epson T252 cartridge, for which you can still use refillable versions. This is what I do with mine, so printing is not at all expensive. This is the printer I use the Inkowl inks with. I also sourced Chinese inks for that printer from refillink.ca and those also work pretty well, but caveats about Chinese inks still apply. The other benefit is that this printer is pretty inexpensive, so you may be able to simply get one for each place if the size is daunting. Print quality is good out of the box, and can be made to be quite good with an understanding of the printer driver settings and if you know how to do colour calibrations it can be made to be really good, but I'm afraid it just will never be quite as good as your Stylus 2200.
