I know a low pass filter leaving the shack on the feedline helps reduce interference noise made by my HF radio to other electronics in my home and/or the neighbors.
It does? I've never seen one that can do that.
A low pass filter, if it works, should allow you to transmit with full power, including full interference, to your antenna and usually that power -- which is the desired output -- is what causes interference to other electronics. The low pass filter only rolls off harmonics that occur above 30-32 MHz or so, and those should already be down by at least 40 dB with almost any kind of transmitter that's been commercially built in the past 40+ years.
If a low-pass filter is actually reducing interference to other electronics, I'd say there's something wrong with your transmitter.