As long as you are not putting rocks in your fuel tank, most fuel is probably not going to clog the injectors. Filter or not, water will still pass through the system unless you have a fuel/water separator installed. Water should not hurt injectors, but enough of it could prevent combustion and even hydrolock your bike in great quantities. Diesels usually have fuel water separators on them because it's rather hard to remove water from their cylinders (remove the head or injectors). Gas vehicles do not, because it's relatively easy (remove plugs and turn over). The Versys, like many other bikes, has throttle body injection, which is basically just a slight step up the technology curve from carburetors.
It just squirts fuel into the throttle body and it mixes with air, as the natural vacuum effect of the engine sucks it all in. It should actually be a pretty decent sized hole on the business end of the injector, bigger than most particulate you'll find in fuel.
I believe that the majority of failures on fuel injected vehicles are fuel pump failures, which are generally due to the clogging of the fuel filters. Whether it's an in-tank sock or an external bulb, usually when you replace a non working fuel pump in a car, there's a nasty fuel filter at one end of it. Either it's not getting enough cooling because a dirty sock is restricting flow, or the pump is overheating because it's trying to push fuel through a filter that's clogged and giving too much resistance.
Here's the problem as stated before: the Versys has almost no room under the tank. The Versys also has a very expensive pressurized hose that is short to prevent the fuel line from going lower than the injectors for some reason. You have to get a filter that would be large enough to provide the flow needed by the Versys when its using the most fuel, otherwise your performance suffers, and the engine could even die at higher speeds.
I'm all for engineering (read: rigging) things up, my bike has lots of zip ties and farkles. However, I would probably focus on finding suitable replacements for the in-tank filter. If you're dicking around with the fuel system on this bike, you gotta take the fairing and tank off anyways, it's just as much trouble to get an aftermarket replacement [read: a sock not specific for this bike] for the in-tank filter sock than it is to mess with external filters. Especially since you need to shield the fuel pump from debris just as much as the injectors. You would just need to be replacing two filters instead of one, to protect parts (injectors) that I've rarely seen fail in 'ANY' vehicle (not just the Versys), and possibly accelerating the decline in a part (fuel pump) that I've seen fail in 'EVERY' vehicle.
I don't think I've seen clogged injectors on here. (btw you can usually fix that with good injector cleaner). But I do I think there have even been Versys fuel pump failure posts on here (which you can usually fix with a new 200$ pump). I could be wrong though.
This is just might two cents. I'm not personally attacking anyone or anyone's idea. If you put an external filter on your Versys, please post pictures and the results. I would just giving my opinion, because I have experience with throttle body injected vehicles and fueling issues in vehicles in general. Do not take my negativity towards the mod as a negatively towards innovation or modifying the Versys. It's your bike!
2009 KLE650 VS
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09' Versys, Plasma Blue. Trax Panniers, Barkbusters VPS, Garmin 665, Escort 9500xi, HID Low Beam, SW Crashbars, Ixil Dual Exhaust, Flipped Stock Windscreen, 10" Round Mirrors, Fuzeblock, Avon Distanzia.