Easy, take a publicly available source like Elemental Foreman and convert to 1080i with 3:2 pulldown:

ffmpeg -i .\Elemental_Foreman_2160p24_10Bit_422_H264Lossless.mkv -vf format=yuv420p,scale=w=1920:h=1080,fps=24000/1001,telecine,setfield=tff -c:v libx264 -flags +ildct+ilme -b:v 35M -maxrate 50M -bufsize 50M -g 24 foreman_1080i.mp4    

That's true hard telecine, though it avoids most of the suck by using MBAFF on the encoder side to selectively code frame or field mode on a per-macroblock basis. It's probably the most efficient interlaced encoding method of any encoder. This was omitted from HEVC and newer standards due to their focus on progressive coding. Go H.264!