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CD74HC4046A: FSK demodulation for 27MHz - with mark and space frequencies 4 KHz apart

Part Number: CD74HC4046A
Other Parts Discussed in Thread: SN74LV4046A

Client is needing a custom FSK receiver that can demodulate 27.255 MHz carrier, where mark and space frequencies are only 4 KHz apart.  I am reviewing Application Report SLAA618 that describes an FSK demodulation implementation based on CD74HC4046A PLL.  My concern is VCO linearity with temperature being outside of design parameters, and I would like to find an equivalent to CD74HC4046A part that can contains a temperature compensated VCO, or accepts an external TCXO.  If not, is there an alternate application note I can be reviewing?


Thank you in advance, 

AS