Rubber magnets in pickups?
I was reading up about the old DeArmond Gold Foils, which have resulted in some of my favorite tones in certain situations, and read that they had rubber magnets in them rather than the standard Alnico/Ceramic pickups more commonly used. At first I thought that this is what helped with their light and microphonic tone, but then I read that not only were these (apparently) used in some old Rics, but they're also a key component to Lace Sensors.
Do any manufacturers experiment with these magnets much? Do they even contribute to the sound much at all, or are they a minor component?
I keep wanting to put some Gold Foils in my guitar but I don't want to [a] route it, and [b] have to worry about the potential for microphonic squawking at shows.
Are there good alternatives? Mini-bucker size would be nice, but not necessary.