Floats is all right place right time.
I consider myself very fortunate to have had all my commercial flying in the float industry. It is very rare for bare endos to get a job (but possible) however the water landings and some ICUS time are the key areas to focus on initially.
It is not easy work; 30 knot winds make things interesting in a beaver as does glassy water with a heavy 206! At the end of the day it is not an hour building exercise, it is doing it for the love of floats.
All the best!