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I have not heard of anyone having something like that (done). You might be able to have someone special make it but the expense would probably be way up there....
Here in Aus there are hydraulic hose suppliers who will also make up custom braided brake lines. Shouldnt be an issue to make the bend if you were able to utilise a right angle or banjo fitting in some way. I'm wondering why you want to though?
Seems to me that the flex line between the trailing arm and the hard brake line going forward, is necessary due to the constant movement of the trailing arm when driving the car. If a single hard line existed between the brake caliper and the connection to the hard line going forward, I don't think the brake line and fittings could take the movements.