I got my hands on an AEKII. Unfortunately, it did not have any cable. So, I had to take it as is. I could not test it. It feels like dampened ALPS. I forgot to bring my key puller, but I don't think a M3501 can be rubber dome. I will be able to say more once I pull a keycap. I was willing to take a risk since it was only $20 Canadian. It is yellow a bit, but not much. But, it's a "uniform" yellow.
Now, I need to find a cable. I am hoping that the AEK which still has to arrive will have a cable. And since I will be using only one of the two at a time, having only one cable should not be a big problem. Initially, I was thinking about pulling the sliders and put them into my ABS, but I am not too sure now. I mean, the AEK II is such a nice looking keyboard, and I already have a working Belkin adapter. Time will tell.