Your only option for printing with bible paper would be to find a true book printer who can use that paper. PODs and so-called self-publishing companies do not do things like that as the demand is too small.
There are thousands of genuine printers who print books. Not all of them do all types of books. Some of them can use bible paper. None of them have online sales platforms. Maybe one of the bible printers would be willing to do your book too.
So your problem is overconstrained and there is no way to do what you want. You will have to change your requirements to get your book done.
Your best approach would be to make the book smaller or print it in several volumes as a set, but then you pay a bunch more for binding more books.
Hardcover binding is not done by a printer. So you would have to find a bindery. Often the printer can direct you to one that would do the hard cover binding for you.
Note that specialty paper and hardcover binding will be much more expensive than places like blurb would charge you unless you print and bind a very large number of books. Get quotes from several printers as prices vary all the time depending on how busy they are. But expect to have to print and bind at least 2000 books to get an equivalent price from a POD or so called self publishing company.
Then you will have shipping. And the job of selling and fulfillment are up to you too. There are companies that will warehouse and do fulfillment, but you still have to generate the sales. And they charge fees for storage and shipping to your customers.
You might be able to e-publish it cheaper with someone like Bookbaby or Booklocker. But there may be limits to e-book size that I am not aware of as I do not use e-books. I do recall that Amazon seemed to have e-book maximum sizes which are far smaller than your 1200 pages.
