The inside and outside (Florida Bay side) of Flamingo are two completely different places with entirely different bottom characteristics... The interior also doesn't have hardly any grass at all (until you're way up into freshwater areas) while Florida Bay is relatively soft and just covered in turtle grass (and other grasses... Poling in the interior is much, much easier than the Florida Bay side of things... The west coast of the 'glades is much more like the interior as well... The moment you get north of Cape Sable you're no longer in the soft soft bottom areas that make up most of Florida Bay.... as well.
I've never used the mud bars myself - but had lots of friends that used them. Face it, $20 bucks for mud bars is so cheap that even if they don't work out you're spending a lot less money and the aggravation of replacing a pushpole fork to find a solution that just might work out.... The address for Moonlighter that Zika posted also shows that delta "fork" with the mud bars attached so you can see what you're buying...
Good luck and post up how it goes - whatever you choose. Over the years I've had Moonlighter poles (and still have an experimental early graphite one that's only twice as heavy as any pushpole I've ever handled -and stiff as an iron rod...), Aluminum forks, mangrove forks (ones we used to make ourselves out of mangrove roots, GLoomis forks, Stiffy forks... and still have at least two or three pushpoles in my garage since I lived or died using a push pole without a trolling motor for the last 20 years (until this summer when we finally added a troller again to my old Maverick skiff...).