It will be interesting to see how this turns out for you.
If the speaker is heavy and the stand is heavy, you'd think that having them bolted together would just be creating one heavy and solid speaker. Then it would seem like just having spikes on the bottom of the stand would be sufficient.
It most certainly is worth trying the points between the speaker and stand to see what happens. A lot of times, what appears logical ends up not being the best way at all, and experimenting like this brings grand results.
Let us know how everything turns out.
Chuck