Now that you mention the 1/4 pounder I've used the similar 1/4" rod mag Rio Grande Muy Grande and gotten some of the heavier P-90ish tones, but not the same. I also have an old Leo era G&L traditional shaped Tele bridge pickup which is built like a P-90 with a flatter coild and mags underneath the steel poles. I like it a lot better than the Muy Grande and find it's great for fatter rock tones, though I get fatter rock tones from a low wind stock Tele bridge pup too. That G&L pickup remained the same after the Leo era AFAIK and you can find them used for really short money given their quality. Not sure why I like it so much better than a traditional P-90 but it may be partially due to the steel poles sunk into the coil, so you can set the coil low and the poles high, or you can ste the poles low and move the coil closer to the strings. More tonal range with those adjustments and I like the coil closer to the strings; particularly under the high E, because it actually fattens the tone, where putting the coil further from the high E reduces the volume but also thins the tone. Volume and tone are easy to confuse when adjusting pickup height, because when you lower the pickup under the high E it becomes less loud, but not less bright. The sound difference between the P-90 steep poles and the Tele alnico rods is pretty major, but in general I prefer the tonal influence of alnico (5!) rods so seek my new sounds using that recipe.