The lasered keycaps aren't that uncommon indeed, there are quite a few models with lasered PBT in Japan, basically any model that ends with a K. Probably because people want a black keyboard but want to actually be able to read the key legends. Unfortunately, they still don't release lasered keycap sets, only way to get them is to harvest them from existing keyboards.
The dharmapoint is a rebranded realforce.
And thats what I meant when I mentioned smooth. All the keycap sets have the same bumpy texture as normal dyesubbed realforce keycaps.
Actually while I know the realforce keycap sets aren't smooth, I'm not sure about the HHKB ones, might want to ask someone with a HHKB about that. They might be smooth. Won't be able to do a 100% replacement but you can at least get all the letters and some of the modifiers.