Hook up your AVR programmer to the ATtiny.

Program the ATtiny to make the fuses to run off of an external oscillator.

Avrdude -c usbtiny -p attiny85 -U lfuse:w:0xfe:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m

Finally program the ATtiny with the firmware.

avrdude -c usbtiny -p attiny85 -U flash:w:tvbgone.hex

Solder everything together.

???

Profit!