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Hi,
I have bought a sonder camino tiagra (50/34, 11-32) but am putting grx on it (46/30, 11-36) using the big and small chain length calculation it should be the same length but as I will never be in big/big should I rake a couple of links out?
I wouldn't. You say you'll not use big/big, but what happens if you do by mistake or not concentrating?
Definately not. Quite aside from the almost certain chance that you will go big-big by mistake at some point, the newer derailleur's run better with a slightly longer chain. I had issues with my road bike and a noisy chain across a lot of the gears until I did some research and discovered it was down to the chain being too short, even though it was long enough to access all gears.
I could explain in detail but if you are interested in the very nerdy reasons why then it's all in this link...
https://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=152332&hilit=chain+length
He's talking about road gears in there but it applies to GRX also.