I strongly favor sticky stuff instead of the little fence. I have peeled off veneer with Blu-Tak, and have learned from my mistake.
If the veneer is applied after the boxes are built, it's probably not stuck on as well as if the box is made from pre-veneered MDF. I think the Harbeths probably are made from pre-veneered MDF. The veneer that I peeled off was applied after the raw boxes were built.
There's a yellow product called Handitak that is less sticky than the original Blu-Tak, and so it is less likely to damage the veneer. It will still stick the speakers very very securely to the stand. I bought a pair of Harbeths at an audio show once, and they were using Handitak to stick them to the stands. Just use a little bit - about the size of the eraser on the end of a pencil. It will spread out when squished, so don't put it right at the edge of either the speaker or the stand or else it will show.
The technique I use for removing the speaker from the stand is to slowly twist the speaker, instead of just prying it up. I think this is a bit less likely to damage the veneer.
For the ultimate precaution, paint the top of the stands with black craft paint. This will stick to the stand's surface strong enough to hold the speakers securely, but will not stick stronger than the veneer sticks to the underlying wood. So this way if something gives as you separate speaker from stand, it will be the cheap craft paint instead of the expensive veneer. Once you can get to the Handitak with your fingers, it is pretty easy to remove from the bottom of the speaker.
I use Handitak on my stand-mounted speakers at audio shows.
If you can't get Handitak there in India, shoot me an e-mail with your full address and I will send you a lifetime supply.