sort Taxonomy field in pagetype by weight

Items of Taxonomy to sort : Term1, Term2, Term3
sorted in Taxonomy list Term2, Term1, Term3
no problem to sort this in a View by weight but I need:

in an own pagetype
taxonomyfield [Term reference] [Check boxes/radio buttons] (unlimited values)

I need this taxonomyfield sorted by weight of taxonomy It is sorted by ID

The only way i found to get this is to add the terms in the right order but it is too late to do this, without any ability to change it afterwards.
I am afraid I can not change the IDs of taxonomy terms in the sql table after they are translated and used in several pages…

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