Yes the PRForms work perfectly in the newest Pier.
The main cause
was indeed the missing readUsing: and write:using: methods.
You can find my code in the official Pier repository
http://mc.lukas-
renggli.ch/pier/. It is the package called Pier-Forms.
Lukas
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Lukas Renggli
http://www.lukas-renggli.ch