Recorders in A=415 are fairly readily available, and some are not disastrously expensive, only medium painful.

Very handy for the keys in which the recorder, although a chromatic instrument, is a pain for fingering and accidentals, because it's almost exactly a semitone down and by pulling the top joint about a thumbnail you can get most of the lower register to play true, a semitone down. As a result when Jacqui was alive we were enabled more readily to do a number of songs in Ab, F#, F#m, and Eb.

However, to my ear, the larger dimensions of the A=415 recorders produces a more mellow and lachrymose musicality that could be very effective on some songs.