G0KTN is doing some tests using this slow mode (5 minute transmissions) on 8m.
Although I do not have my usual 8m dipole up, I am trying to RX Trevor on the endfed used for my FT8 EA 8m QSOs recently. Unlike the EA stations, this would be by tropo. Theoretically this mode is about 6dB better than WSPR2. His station is on from 0800-2000z.
Worth a try!
It's funny how reports and QSOs are easier with more distant stations on FT8 than on more local stations on WSPR and FSW4-300.
UPDATE 2036z: G0KTN not copied sadly.
