The "don't go into deco" mindset combined with the topic of this thread brings me to a tale with a moral about both combined.
I went on a Galapagos liveaboard as a single diver and was roomed and buddied with another single diver whom I had never met before. He was DM certified, but not insured and not practicing. On one dive, as we were getting near the end at about 85 feet deep, he suddenly started swimming rapidly toward the surface. I saw him start and was able to catch up with him at something like 50 feet. I took a hold of him and gave a "what's up?" gesture. He raised his console to show me his computer with a look of sheer terror in his eyes. I knew that computer well, and I didn't see anything of concern, so I repeated the "What's up?" gesture. He started up again, still in near panic. He stopped at safety stop depth, and he again showed me his computer with that same look of terror. It was counting down a safety stop.
We surfaced and were picked up by our panga, at which point he told me what was up, his voice trembling with fear. When we were at depth, he had looked at the computer and realized that he only had a couple minutes of NDL left, and he thought that meant that he had only that time to reach his safety stop without going into deco, at which point he would immediately enter a painful debilitation that would require an evacuation to a hospital. I tried to tell him that as he ascended, his computer had increased his NDL time, which was why I saw nothing of concern when he first showed me his computer. He refused to believe me, and as other divers got on the panga, he repeated the same harrowing, near-death experience story to each of them.
The lessons:
1. In this thread, the OP asked about going near NDL on the tables, ascending a little, and then getting more time. As was true in this story, yes, that does indeed happen, but the tables have no way of measuring it. My research on NDL ascent profiles (and I did research this) indicates that if you start your ascent within NDLs, you can ascend as slowly as you like, and you can even do a prolonged dive experience at a shallower depth, as long as you do not go into deco. Everything changes when you go into deco. A computer will measure that for you; the tables can't. The people who try to make the tables do that may make safe ascents each time, but that is at least as much luck as design.
2. If you do unintentionally go into deco, the computer will safely guide you to the surface, provided you know what that looks like on your computer, and provided that you have enough gas to breathe while doing it. You should be just fine with that little bit of deco time. The tables do not have that ability, so you have to go through a generic emergency decompression procedure and then stay out of the water long enough to start over on the tables from scratch before your next dive.