Barrett used an Octavia on "No Man's Land" on his first solo album.
There maybe a few fuzzed notes on "See Emily Play", which may have come from a Selmer Buzz-Tone or a Tonebender.
There's Echorec all over the first PF album, and Barrett uses Wah-Wah on the last Floyd single he played on...
By Agartha he's using two wahs (halifax & morley), a mosrite, and various guitars with his own tuning systems. I believe, however, much of the phasing may come from running the guitar into a Synthi Hi-Fli, much like Brian Eno did with Phil Manzanera's guitar in early Roxy Music.
He used early...
Probably exactly the same pedal then. Sounds fine to me.
If the Tech 21 Blonde was still really available I would buy that in preference anyway, but it isn't. The Joyo, Heur and Horse models are all the same cheap knock-off anyway.
Ah yeah, I even had one of those, but they're like at least 40 years old now, and I wouldn't use one except for studio color.
I was thinking of the EHX dmm Hazari, which is true stereo, and a wonderful box, but not in any way analog.