Just had a refresh look over the code. Definitely will be possible. Just a matter of figuring out an implementation. @NiLuJe would be best person to figure it out.
As an aside, Once I started using the OT capability, I've come to regret using margins to determine the printable area. In hindsight, an x,y,w,h system might have been better. (as seen by my arithmetic gymnastics here:
https://github.com/shermp/Kobo-UNCaG...uprint/eink.go)