To answer for g-force - no, that's not possible. The reason is that the anti-aliasing function also doubles the height of the video. The following stage in the script crops/resizes to an anamorphic image with borders; I assume it's the size of the video frame at this stage that you have used to determine the size and position of your subtitles (is it the script in this post?)

One easy option you could try would be to add interlaced=true to every subtitle line. This parameter adds an additional blur to the subtitle text (its purpose is to reduce flicker on interlaced displays).

Beyond that, you would have to look at a workflow that involves using your subtitles on a blank clip, adding a resize line after the subtitles so that they then match the non-anamorphic GOUT video, and finally adding this clip as an overlay to the GOUT video before the anti-aliasing.