No, you won't blow the crystal.
The crystal is very high impedance at any frequency that isn't a resonant frequency, so it can effectively be regarded as not there. I guess the capacitors are small enough not to upset the ISCP. If you haven't got any capacitors, there is a risk that the crystal will run at an overtone, so I would suggest that you have around 22 pF to ground on each side of the crystal, and a resistor in series with the CKO pin of the PIC. You could also put 1 - 10 kΩ in series with the CKIN pin, which won't make any difference to the running of the oscillator, but will certainly prevent the ISCP being upset by the capacitors.
A watch crystal has an ESR of somewhere around 40 kΩ, and a drive level of 1 μW, so the voltage across it should be less than around 0.2 V at its resonant frequency. Watch crystals have a very high Q, so it takes a couple of seconds for the oscillations to build up, so to get to the point where the crystal were to be damaged, the output of the ISCP would have to have a significant signal at 32.768 kHz, that would have to be sustained for a few seconds. That is highly unlikely. I think that the ISCP runs much faster than that.