Rylai's Crystal Scepter Mana and CDR

If they idea of Changing Health for Mana and CDR is implemented, in my opinion is a good way to chance the overall use of the items + it would become and alternative to building 1st . like many champs, specially poke/ peeling mages like do

so right now the build path is [ (400G) > (600G)] + (435) + (1250G) + 515 G = 3200 G for 400 Health /100 AP + Passive

If we replace the Health for Mana and CDR, given the current item, the build should be similar to (2900G)

[ (435G) > (465 G)] + [ (435G) + (350G) > (115G)] + (850G) + 450G = (3100G) 10% CDR/110 AP /400 Mana/ Passive

its slightly more expensive, gives less CDR than but more AP in exchange.