this was made by other people (famously Jimmy Giuffre had his tenor altered this way) and there shouldn't be any difference in tuning.
We have talked about it numerous times
https://forum.saxontheweb.net/showthread.php?129322-Jimmy-Giuffre-s-tenor-neck
However , have you thought of ordering one of these eastern music necks asking for an alteration in design? It will cost you a lot less and you won't alter the original neck, should you ever sell the saxophone.
We have talked about it numerous times
https://forum.saxontheweb.net/showthread.php?129322-Jimmy-Giuffre-s-tenor-neck

However , have you thought of ordering one of these eastern music necks asking for an alteration in design? It will cost you a lot less and you won't alter the original neck, should you ever sell the saxophone.