the idea of allying with Turkey, and potentially having to deploy troops to defend them should it come to that, doesn’t sit well with me.

That a good thing which comes from a larger coalition. The more countries involved that won’t attack each other, and the more counties that will aid other countries in the coalition if needed, the less likely there is a need to raise those defenses. I’m glad to see Finland and Sweden joining, not because of the troops and resources they might commit, but because it improves everyone’s self sovereignty, including those nations which aren’t full members.