I had the exact same problem with a leadgen site targeting Europe. What ended up working for me was SpeedyIndex. Their tool lets you specify which Google version you want to check — like .de or .co.uk — and shows the index status per region. I used it to verify which landing pages were visible in which country, and it helped me fine-tune my hreflang and internal links. Within a few days, I saw traffic coming from Germany and France where I had zero exposure before.