Has anyone any experience of cutting down the seat mast on the (now discontinued) ASR-C model to fit a dropper post? Is it even possible? Is there a normal tube down there to fit a post into? What internal diameter?

This is the bike in question:

link

I dont think that version of the frame is dropper post friendly, it has that specific seat tube and post.
I have the next version which uses a standard 30.9 post and is fine with a dropper post.

Thanks