Just like everyone else here, I woud strongly encourage you to go back to a single gasket.
If you really want to work that angle, you could go to any local machine shop and have them machine a spacer for you. It'* just a flat plate with a few holes in the right places. A competent hand with a cad program and a CNC machine could run one up in about an hour. Shouldn't cost you too much, and with the regular gasket on either side, your risk of a failure would be just about nil.
Truthfully, though, you won't get any gain out of it unless you already have a good intake before the TB.