Yes the medical grade liquid stitch would be the way to go I think Stone. If one of my fish gets a brain tumor I don't like their chances of survival with me at the controls. Betta are even smaller so anything more than an external growth or stomach tumor would be way beyond me. We had an egg impacted female turn out ok here after a minor operation so that was lucky on her part. Ive had really healthy fish for awhile so that's been a blessing (knocks on wood).
Next week I will have a big cheap sale on betta. Half moons, male female and baby. All will carry giant gene but who knows how big they will get. Lots of variety and I can ship anywhere in Canada.
I like how the Singapore show has a class just for Giants. I hope the IBC shows in USA and Canada start doing this as well. Totally biased campaigning for class E.