I have researched this option a ton and have nothing but deadends. No one seems to build a marine solution for our year engines. Let alone finding someone to custom tune the ECM. That's why I seriously persued the engine swap route. I found it more cost effective to swap than try to custom build a FI solution and I didn't want to deal with custom issues during my short boating season or ruin a vacation.
I am interested in following your search to see if you are able to find a FI solution.
2008 X-45 Pro Tour Red and White