The Florida tax man allows 90 days for non residents to remove their boats after purchase. The broker will organise it for you. If that is not long enough then . . . .
Assume you are close to settling, you can save a little time with registration
by asking the broker to organise a tonnage survey
before you make your final payment. After buying
you gather all the papers and $$ and register in Canada.
Some weeks later armed with your Canadian decal, papers and number you return to Florida and sail to Nassau
for a few days. On your return to Florida ( with freshly applied Canadian numbers ) you apply for a US cruising permit
. They are only $27.50 for a whole year which will be more than enough time. Details here
This method avoids all the hassle with Florida taxes
and you get to visit the Bahamas
too. Such a deal.
If you can't beat the 90 days and can't make Nassau
then you will have to try flying under the radar
. Good luck.