I'm a fellow Florida Sidewalk Rider, although in my case more because I live right between most of the Orlando colleges and have ~6 foot wide sidewalks for most of my routes. Most likely not an accident since the current official plan is to try and shift 90% of all bicycle traffic onto dedicated facilities for every 10% of painted-only lanes.
In these Florida streets, where mostly everyone drives, I'm the lost sheep in over sized sunglasses waiting at the curb.
I've found the most effective method is to walk the bike out just enough they can't turn right or pretend not to see you then quickly mount and ride the rest of the way across while giving the death glare to perpendicular traffic, it's a trick I picked up from UCF's bicycle officers. Sometimes the "HALT" hand can work too, but with the potholes around here I prefer having both hands on the bars.