Hello mikie2084,
Yes, I think you can but it may take some experimenting. A typical MD sends a pulse at a frequency, then receives it on a seperate coil of wire. The system measures changes in the inductance between the two fields.
The system expects there to be a known resistance and inductance on the loops. If these are so far out of spec on the windings of your home made pointer wand, then the circuit might not work well at all.
If we can know the specs from a schamatic on the frequency the detector uses and the resistance of the coils of wire, then the12volt com would have the tools and folks to help you finish the equation and determine the size of the new wand bobbins and how many windings etc.