Trellium

I am a painting. But I don't know what I am a painting of because nobody who looks at me can tell. If you have some Stormlight I could be convinced I am a painting of something in particular. Or if there are any forgers listening maybe you could change my past so that I was sketched by Shallan instead! Would you rather be hemalurgically spiked by an expert and survive with a torn spiritweb, or experience the shaod and have to spend 3 years as a hoed, but eventually complete the transformation to an Elantrian?

There very well may be a bead representing the planet or system of Roshar, particularly given that every sentient being in the system / on the planet has a strong connection to and conception of Roshar. However, beyond the problem of reaching it in the sea of beads, which is probably doable to someone with the requisite skill in manipulating the environment in shadesmar, the bigger problem is how much investiture would actually be required. This feat would probably be even harder than when Leras and Ati created Scadrial, as Rosher would clearly have a very strong "inertia", or desire to continue existing as currenrly perceived by the millions of minds connected to it, beyond even that of Stick himself. Therefore, even if such a bead were to exist, and even if it were able to be reached in shadesmar, it would probably require a quantity of investiture sufficient to cause the bearer to ascend to shardhood, which can probably only be obtained by claiming a shard.

Can you post the specific WoB language? If we only look at at the fact that Brandon specifically said "currently", that leaves the door open to Vasher having more knowledge in the past, but doesn't really evidence anything. However, now that you point out that Vasher "knows the commands to make you forget", I think you are on to something. I mean, Vasher is the kind of guy who killed the love of his life just to prevent the knowledge of how to create a Type IV Biochromatic Entity from spreading. I doubt he would hesitate to purge his own memories of this same knowledge. The only hole in this theory that I see is that if Vasher could really do that, why didn't he just make Shashara forget how to create a construct like Nightblood instead of killing her? Perhaps the target of such a command needs to be a willing participant? Either way, it makes sense that Vasher would do anything he could to prevent knowledge of how to accumulate massive quantities of breath from Rosharian Stormlight from spreading, as gathering the necessary investiture is itself a major barrier to the process of creating "another Nightblood". This would include purging his own memory of any useful steps in the process.