You can output to SDI using Wirecast. Follow the instructions below to connect Wirecast to your SDI output.
Open the Output menu from the top toolbar.
Select your output channel on the video card. For example, BlackMagic Quad 1.
Select your output resolution and click Start Output to enable the output channel.
Once happy, press the Go button under the output window to send your LIGR overlays to your output channel using SDI.