JJeffrey Appreciate the quick response!. I figured there shouldn't be an issue other than stuff like not being able to get Business Extra points and having to deal with JAL customer support if something goes wrong (not too worried about this either) but I couldn't find much chatter anywhere about it so I was curious.

Likely hard to search for info anyway since any search attempts would just end up with stuff like booking a codeshare on JAL metal on AA.com or some equivalent.