From the CRL
“ Custom visor designs are allowed. However, at least 1/3 of the total vertical t-portion must be apparent. The Executioner helmet represents the bare minimum allowable area of visor exposure allowable. If changes are made to the Executioner helmet, they must not further obscure these elements.”
So unless you cut the necessary 1/3 vertical for the T-visor, I don’t believe it’s acceptable. I’m a new member, so I may be incorrect.