As you said, the topic is indeed under researched. It surprised me even more when I saw that in the English speaking world, there is even less information regarding the topic. That's why I wanted to share my knowledge with you. I can completely understand your distrust but believe me, all of what I said is true and has been researched. In Germany, there's a huge community and various websites regarding the topic of converted left-handers.
Since you said that it didn't matter to you if it is in English or not, I'll show some German websites to you.
A general website about left-handedness and conversion. (That's where you will find most of what I said.)
" For the use of the wrong hands, the brain consumes 30% additional energy. When writing while all other regions of the brain involved are drawn into the unnatural stimulus sequences. The result is a disorder for which the grants throughout the life more energy must be expended unnecessarily long. Not every man can well bear this same burden. Some children react already in primary school with poor concentration, memory failure, speech blockages as mild stuttering or Sprechunwillen, clumsiness, confusion between left and right or with mild forms of dyslexia, but also with migraines or allergies, but especially with school displeasure. Others feel overwhelmed until high school, when others then it's become very difficult again in advanced adulthood, to identify the cause. "
Also something about reconversion:
The next one is a homepage of a left-hander counselor where you will find a lot of information.
Well, I'm not a huge fan of Google Translator but I think it should get the message across. If you need anything else, let me know.