The 4.92 MHz resonator with C94 & C95 not removed gives about 4.8 MHz. ?The problem is that there's little variation since the varactor's capacitance swing is masked by the 100pF. ?I give some ideas for overcoming this in the video. Or maybe use a big old variable capacitor with all gangs connected together.?
As for the crystal option, two crystals in parallel in a super VXO should give a lot more than 3 kHz swing in a properly optimised VXO with the right inductance. More like 10 or 15 kHz. ?Again ideas in the video. So the 4.75 MHz crystal could be a good option if you can't get the resonator. ?
