Hi there. I have just begun editing a project in Premiere. The footage is 50P. The issue is my older Blackmagic studio express box only outputs 25P. The new Blackmagic Ultrastudio (https://www.bhphotovideo.com/c/product/1335021-REG/blackmagic_design_bdlkulsdminhd_ultrastudio_hd_mini_with.html) outputs at this resolution, but only through Thunderbolt 3.
The problem is, my 2016 5K iMacs are Thunderbolt 2. Does anybody know of a solution that won't cost $2000?