@eight here at our university we use the Hollyland Mars 4K for Kameras: https://www.hollyland.com/product/mars-4k They are cheaper than Teradek but they have a delay, they say 60ms on the website but its rather 70ms.
I have tested SurgeXT extensively in Isadora. however, I used OSC communication to programmatically control presets and other parameters. Of all the VST’s I looked at during the testing phase Surge XT stood out because of the functionality of accessing preset effects lists through accessible communication protocols inside Isadora.
Yes, both files need to be opened by the same version of Isadora. Open one izzy file, then use the file/open menu to open the other file. When opened in the same version of Isadora you should be able to copy and paste scene from one to the other.
