Well, I only have a fraction of that invested in my L-Glass SLR shooting bag, but you are right. After 10 years, my lens pens have worked extremely well with no issues of damage to their lens surfaces!
SONA tech service rep just confirmed that using a "clean" lens pen will work very well. Actually, the Swaro cleaning kit has a lens pen in it! Tech stated to just make sure any and all solid debris are first removed from the lens surfaces, as with the natural hair end of the pen and\or a good air bulb blower.
Ted