PaintedCZ's VCCV English reclist is popular in the overseas UTAU community, with an abundance of USTs available in that format. These USTs can also be converted to the Arpasing standard.
Using this plugin on a UST will convert it from CZ phonemes to arpabet phonemes. However, this will not render it perfectly compatible with an arpasing voicebank immediately. (For example, some notes might have more than 2 phonemes.) Please make adjustments to fit the bank.
Original plugin by ChieP
Converter inspired by Ivory @TheIvoryShield
Plugin modifications by KLAD