If you can get a real spinnaker pole, it will be stronger, and less likely to collapse than a whisker pole. A 45 foot boat generates strong forces on the gear.
You're limiting your options, imho.
Ann
__________________ Who scorns the calm has forgotten the storm.
Try Stan at antiguarigging. I bought a carbon pole off him last year and left him my old aluminum pole to get rid of. Selena pole for a 49 foot boat. Got rid of it because it was too heavy to easily use. Carbon pole much much lighter and easier to use