i think the palmer and the mooer would be unsuitable as the speaker emulation rolloffs only happen on the XLR out,
so you wouldnt be able to apply them just to the suncoast, where as with something like the custom screaminator above, you could.
plus, with a custom option you can tune exactly which frequencies are cut, leaving the low end unaltered.
i say going with any sort of killer filter or EQ in the suncoast loop is your best bet, something tiny