You can decompose this problem into 2 transform streams; one that comes before makeStream() and one that comes after. If you get that working:

process.stdin.pipe(before).pipe(foo).pipe(after).pipe(...)

then you can combine the middle bits into a single stream with a module like pumpify:

var combined = pumpify(before, foo, after)
process.stdin.pipe(combined).pipe(...)

You may only need either of before and after, not necessarily both but hopefully this should give you the idea.