Here's what rhymes with formalised.

Consider these alternatives

codified / side formalise / normalise superseded / needed formalize / size reestablished / established abrogated / dated rationalised / nationalised formalizing / rising ameliorated / dated institutionalised / institutionalized promulgated / created disestablished / established twinning / beginning regularized / secularized codifying / dying mooted / included formalization / ormalization promulgation / relation arbitrated / dated reincorporated / stated formalizes / enterprises