Kevin is right, there is no field interlacing at all in a 59.94 720p footage. So in AE, you don’t need to do anything with the pulldown menu in Interpret footage, except to leave it off.
You can simply drop your 59.94 footage into a 23.976 timeline and AE will figure it out correctly on its own. (that is assuming that they recorded an actual 23.976 frame rate encapsulated by a 59.94 video stream).
In 59.94 footage you will see 3 full progressive frames followed by 2 full progressive frames of the 24p footage. 3:2:3:2 etc with no interlacing going on.
Whenever you’re done, you’ll need to use a converter or a separate render in after effects to convert your new 23.976 rendered video to the 720p59.94 standard. This happens pretty easily as well, provided you don’t tell it do do anything tricky like pixel motion or inter-frame interpolation. It should just spread out the frames 3:2:3:2 on its own.