As long as the stock needle will close off fuel flow, it will acceptably meter pressurized fuel flow. I've used 36X needles/needle assemblies on my brace of 35/36 X motors w/bladders (pacifiers, pen bladders, surgical tubing bladders, etc, etc) since the beginning of time and they do fine IF the assembly will close off completely. You can determine if it will satisfactorily shut off flow by attaching a clean piece of fuel line to the needle nipple, completely screw the needle inward until it's fully seated, then suck on the fuel line. If it makes suction, it's closing off perfectly fine, and the assembly will be more than adequate for pressure use.
Good luck!