You can view pure HTTP website through VPN. It basically encrypted tunnel between you and VPN server through your ISP. So your ISP couldn't try to interject the encrypted connection.
However, your browser might prevent you from connecting to http due to strict https only policy. My browser will stop any connection to http page and throw up a warning.
However, your browser might prevent you from connecting to http due to strict https only policy. My browser will stop any connection to http page and throw up a warning.