Benji with a Multi and 5CM
A pair play Benji with a weak NT, 5 card majors and a multi 2C. The 2C bid is the same as in "normal" Benji but includes a weak 2 in diamonds. So 2C is either weak 2 in diamonds, 8PT in a major/9 in a minor or 23-24 balanced. Responder bids 2D with a negative and anything else with a positive. The 2D opener is game forcing as per standard Benji except that the balanced option is 25 plus.
(a) Is this a legal system? (Assuming that the system card is properly filled out and that the 2C and 2D bids are properly alerted)
(b) Is it wrong to describe the system as "Modified Benji" or possibly "Benji with 5CM and Multi".