Hmmm. While that's a solution, I wouldn't be satisfied with random arrow keycaps here and there. Finding high quality XDA or DSA profile keycaps, however, could present its own challenges as most of the high-quality vendors produce mostly Cherry profile. I have a couple of very high quality KAM sets (uniform like XDA and DSA) but those aren't any lower in profile than Cherry keycaps, so probably not well suited to low-profile keyboards, either.
Fortunately for me, the key that was my problem was the G key so all I just had to give it a friend to avoid the two-tone junkyard car look.
I hear you on the XDA keys. It doesn't appear like they're very common. I wouldn't have this set if they didn't come with another keyboard and I couldn't find this set sold anywhere as a stand alone set.