Aquarion has fiddled with the backend for me, and installed Askimet. I think we should now be in a good place.
So, if all works well, you don’t need a wp-account to comment – you just need to provide an email address.
When you make your first comment with any email address, I will get a notification asking me to check it’s not spam, and then that email address should be fine to comment with for all future posts. I don’t believe your email address is shown to anyone but me.
Please try this out, and let me know how it’s working for you.