"I am not going to use C syntax in assembler - I want to access SFR variable only!"

What you actually want is a common syntax, so that you can use the same declaration in both 'C' and Assembler.
Unfortunately, there is (apparently) no such common syntax. :-(

"it is not possible to access SFR variables declared in C"

Well, not exactly...
In your assembler, you must use assembler syntax to define it; and in 'C' you must use 'C' syntax - the Linker takes care of ensuring that both symbols actually refer to the same object!