Using SFR as GPR

Folks, i am fresh out of bank 0 gpr, and I need one more byte. 16f886 MCU.
Since I am not using the EUSART can I utilise the RCREG and the TXREG SFRs as regular GPRs?

I note that sfr 08h isn't used in the '886, is this available as a gpr then?

Simulator fails 08h and allows the EUSART TX/RC to be used as GPR.

RCREG is a read only register I do believe. However, EEADR and EEDATA I believe can be used as a GPR as long as you don't initiate an EEPROM read/write in your code.

The sim is allowing the SSPBUF as well...as I am not using SPI or I2C, there seems to be no impact on the program.