Does it have to be Ai/InD? There used to be a special engraving software that would take OTFs without subroutines and with a different suffix, and it would leave out the closepath statement when interpreting the paths. Should be mentioned somewhere in the depths of the forum archives.
Edit: Here is AppleScript code that opens every selected path in Adobe Illustrator. Feel free to adapt it to your needs. I guess that something similar is possible in InDesign:
tell application "Adobe Illustrator" tell document 1 -- frontmost document set numberOfPaths to count path items repeat with i from 1 to numberOfPaths set thisPathItem to path item i if selected of thisPathItem then set closed of thisPathItem to false end if end repeat end tell end tell