I'm pretty much sure that your patch is already integrated, but I got a little bit confused when you talked about patching the package in Sid. Otherwise it is a matter of backporting the last version from Stretch to Jessie.
You are correct - the bug has been fixed in stretch, but not yet in the bpo package for jessie - I thought it had not been, must have missed it - so upating the bpo package to what's in stretch would be fine. I only mentioned sid because I thought the bug had not been fixed at all - apologies for the misleading info. So... is it much work to get the stretch version in to jessie bpo? The background is we have a customer who wants the fixed version to work on jessie images - we can do a mini-repo but they (and we) would rather it was fixed for everyone.