I have a strong suspicion that Toucan would easisly agree for distribution of converted and remapped rose models. You see, there already exist a pack of his plants converted to Poser props - it was released through Rendo freestuff area, although I can't find it anywhere and the readme doesn't state who did all the converting job (Ricabri IIRC, but can't be 100% sure). But the readme states two other important things: that Toucan-san communicates through translating software (so can understand English e-mails) and that he says "When a lot of people use my flower, I am glad". I'd say write him, nothing to lose, but with positive answer you may save some people grief with using apps they're not familiar with and save yourself problems with packaging that stuff for legal redistribution ;)

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Outdated gallery over at DeviantArt

Fics at FanFiction.net and Archive of Our Own (AO3)