The new Wsprdaemon version 3.0 software running on 20 sites from Maui to Europe is configured to simultaneously decode and report to wsprnet.org WSPR-2 and all of the FST4W-xxx modes on 630M and 160M.
While Spring and Summer are not optimal for those bands, I am seeing FST4W-120, -300 -900 and -1800 spots in Europe and on the East Coast.
So if you want to experiment with transmitting FST4W, there are now many stations listening for you.
On 2200M AI6VN/KH6 in Maui, N6GN in Colorado, and WA2TP in New York are decoding all the FST4W modes.
I expect that soon many the 50+ top spotting stations will be running Wsprdaemon Version 3.0 and extend FST4W listening coverage worldwide.