As I recall...
As I recall Atlas made curved switch tracks at one time.
Where they are now- well- they thought that N would take off at the time- about 20 years ago- prolly found out that they weren't big sellers- then!
The way things are goin'- if Atlas won't re-introduce them (and believe me- they have people researching these sites for marketing schemes) someone else will. The question is- can ya design around it, or are ya willing to wait?
I say design around it and lament what could be or forget the lament and run trains.
Regards,
Mark