The weight plates are 2 inch diameter. Most stands similar to K&M have about a 1 and 5/8s inch pole. I don't know if the latching mechanism comes off the top, but I'd think it does.
Those weight plates are deeply dished on the side you want face down. I don't know if this would actually touch the floor over the K&M base or not. You could put 3 or 5 rubber furniture pads under the edge of the weight plates so it doesn't rest on the speaker stand, but if someone bumps the speaker or stand it still keeps the stand from tipping over. I would think the K&M base would not be damaged by the plates, but I've not seen that one in person.
If you were to use some steel pillar stands, many of those you can fill them with sand say halfway up. It both dampens the stand from ringing and adds weight low near the floor. Play sand is cheap and clean. Just be sure the stands have no pinholes in the bottom and maybe add a trash bag inside to be double sure.