you should think the other way round. you can easily record 1080p25, use this for your PAL-DVDs, and then for int. distribution you should conform it to 23.98 and create a NTSC-version out of it.
using this workflow is the best way, as you don´t need to deinterlace your footage prior format-coversion and if you are conformed 1080p23.98, you can create blu-ray for int. distribution out of it as well.
and finally: this is a common workflow!
cheers (from germany)
danny