Coinbase and FDIC insurance seems tricky at best... I think it only covers deposits made via cash from federally recognized institutions, and will only be covered if you leave it as cash.
If you are transferring tokens in and/or converting tokens to cash, I don't believe those transactions would meet the criteria to be covered by FDIC at that point. I might be wrong on that assumption, but FDIC is only deposit insurance, not withdraw insurance, and its under very specific terms.
