I think the only other route would be to leave it as is. It's not a big issues at all and I'd be perfectly happy leaving it as is, but if there was no danger, I'd remove it.
You could obtain a Stamp Lift box. It is a small plastic box with a raised tray inside on which you place a stamp to remove it from paper. Water never touches the stamp but humidity in the box is absorbed by the paper over a period of time, making it relatively easy to separate the stamp from the paper. Often, there is minimal disturbance to the gum. Once or twice it did an unsatisfactory job and then I soaked the stamp. There is a liquid version of Stamp Lift that I have also used. It works very well but I do not recommend the liquid for stamps with bright white paper.
Nice stamp (bent corner perf is a very minor flaw); would be good to see it off paper to make sure there are no hidden faults. However, the only stamps from this era I have soaked were from the 1897 Royal Family issue. I soaked dozens of them and no damage resulted but this stamp is 30 years older. Probably wouldn't hurt to soak it (and I would do it) but I'm no expert.
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