It might be of interest that Dr Amir Khan has done one of his (usually excellent) "Let's talk about....." posts about Pernicious Anaemia on his Instagram account. The point of these is to be pretty short & give the basics of whatever he is talking about, so there is a lot more omitted than included! But it's a positive thing, he is usually very receptive, & he is well known & has a big platform.
If not already done so, it would be a great opportunity for PAS & others to try and get him more on-board and advocating for B12D & PA.