My productivity has been really, really low as of late, but I have general reasonable expectations it'll improve sooner or later.  Have not forgotten this SRFI (although I'm not pleased that for me general embedded work is realistically off the table until the semiconductor crisis abates in a year or two), am taking a side tour to learn Scheme macrology better since it's a key to making the stty level code reasonable.  So sooner or later this SRFI with one foot in some of the oldest of UNIX details and the other in modern Scheme will get moving again.