Bujo

So, as I've mentioned in comments on a few previous posts, I've changed notebooks recently for my work bujo and it's been a revelation. Unfortunately I have realised that my holy grail notebook might not exist.

Here are the qualities I want, in order of preference:

1) B5 or quarto-ish size (definitely larger than standard Moleskine or A5)
2) larger than 5mm, preferably 7mm ish
3) grid or dot grid!
4) nice paper
5) as close to white (rather than cream) as possible

I'm currently using a J Burrows journal which meets 1, 2 and 4 above, and is okay on 5.

I reeeeeeeally want something that meets 1, 2, and 3 - a B5 notebook with a 7mm grid or dot grid - but it's really hard to find anything like that and I suspect it just flat out may not exist.

Does anyone have a line on such a thing or any suggestions to investigate?