Is it possible to get this accurately attributed over Reddit?
In the past when I have needed attributions I have gone to specialist forums. On two occasions it worked. I'm not saying it's impossible over Reddit, but I would trust a specialist forum more.
On one of those occasions the poster wrote a lengthy account of why he thought this X belonged to Y, backed up by photographs of his own personal collection of historical catalogues. Sufficed to say, he was right when I took his leads.
You will not get an accurate attribution over OCUK, only people Googling things. I would suggest going to an oriental literature or calligrapher forum.
Your other option is an academic. In the past I have written to academics from universities even if I am not part of that uni, and they have, on occasion, helped. Even writing to the Chinese dept of the British Museum could get you somewhere. The BM has also helped me in the past.