I use a K&N Filter. I heard some people say they don't filter dust that well but I haven't had any problems.

What options are there (and that do not require any 'mapping' changes)?

I'm told that the 690 only requires mapping changes if you modify the air box; a new foam filter alone won't change it so much that a 15 minute idle won't allow the bike to adjust itself.  Here's an excerpt from an earlier post:

I forgot to mention, once the pipe is physically installed, you have to conduct a 15-minute idle from a cold start.  This causes the KTM's fuel injection computer to reset itself to the pipe's new parameters.

The procedure is just as simple as it sounds.

1. Start the bike when it's cold (as in first thing in the morning).
2. Start a stopwatch.  KTM designed this process to take 15 minutes.  Be patient.
3. Do NOT touch the throttle AT ALL, or the process is reset and you'll have to start over.
4. When the 15 minutes are up, don't touch the throttle, kill the engine using the switch on the right side of the handlebar, then kill power with the key.
5. You're done!  Start your bike and go for a ride.

3 Tips:

1. For peace of mind, you may want to use a household fan to blow at the radiator (your bike will get hot while sitting at idle).
2. This process is only for fine tuning; it can't compensate for something as drastic as opening the airbox.  So until there's a viable option for messing with the 2014's computer, leave the air box alone--you've plenty of power!
3. Though I've not had to do this yet (living in Houston), I'm told that this process can also help even out idle issues while navigating extreme changes in elevation.  So for those of you crossing the Rockies, this might be a worth keeping in mind.

All this said, I went on a 12-hour desert rally a few months ago.  There were plenty of participants, so I was choking on dust all day.  Afterwards, I popped the air box cover and saw that my filter was still looking new.  I STILL haven't bothered changing it.  So your concern about the filter may be unnecessary.

If you insist on a new filter, there are several out there but I don't have any direct experience.  I had a UniFilter on my last bike and it worked fine.

Thanks for the replies - I ended up getting the Unifilter pod filter (dual pod looking one) - Part # NU-1417ST.  Thank goodness I called vendors before ordering - even though they listed 'x' days shipping, they would not actually process the shipment for 2-3 days!  Really?? - found a vendor that had them and could ship today (and pretty good price also) - hopefully it will be here Tuesday!
I also talked to a guy at Unifilter who was very helpful.  He said it was basically the same filter as the 'orange Aussie filter' but much cheaper (Aussie one is apparently like $140)  Normal foam filter care, nothing special required.

I did not really notice it bottoming out... and so what if it does - still a good filter.

Haha good deal. I was just a bit worried that our 14s had a different air box or something after reading that dudes post and then seeing none of the websites listed the 14 for the uni. Thanks for the reply, man. I'll probably be ordering one myself.

NO- do NOT use the UNI US 1417 filter in the '14 as it has a shallower box than previous model years - you will bottom out on the bottom of the box, the filter will not lie flat on the opening and you will pull out your brass airbox inserts trying to get it to smoosh down. KTMtwins has removed the '14 from their compatibility chart. Use instead AU 1417, which still bottoms out but only a little bit.

The folks on ADVrider thought I was being paranoid but I called up KTMtwins about it and lo and behold, a couple weeks later they took the 2014 off their fitment list for that air filter and offered me a refund. I picked up a (cheaper!) AU 1417, it shipped quickly and installed relatively easily.

Just goes to show - just because you're paranoid doesn't mean they're not out to get you!