I very much appreciate you for helping out a random stranger from the internet. Yes, I'll be eagerly waiting for your testimony. Shouldn't the Deluxe Grand Siberian be double in size compared to the Basic Soft Polyester judging by the Moe Pillow ad? I assume the microfiber one is similarly sized to the latter; though, I could be wrong.
This is probably your best bet, $68.80 and full size:
https://www.amazon.com/vucosfly-Dakimakura-Hugging-Interior-Cushion/dp/B08922RTZ...
Only 1 left though...
For the price, the risk is really not that great when you take into account Amazon's policies and return rules. However that is up to you. I will update this post to give you my feed back on that polyseter fiber pillow when I arrives later today.
Okay, the 20x70 polyseter pillow arrived today and I have to recommend getting the 23x70 Deluxe Grand Siberian one. The pillowcase just fits better and it is fluffier too.