Good to hear you found a way to get it out. Was looking online for solutions and there are no magic trick to this. I found this web page addressing a couple of alternative options. www.peterman.dk/windsurf-removing-broken-batten-1000.htm

Ouch!

Here is sailworks instruction on batten repair...I have same thing to do , middle tube gor shattered and I need order new piece...

www.sailworks.com/batten-removal-installation