If DI kits were avaialble, you would know about it.
even for a standard EFI kit, it would be a custom one off set up requiring it to be designed, installed and dyno tuned. setting you back a few thousand dollars.
if you were knowledgable in fuel injection, bought cheeap parts, did all the work yourself and got a decent deal for using a Dyno you could maybe do it for $1500 but will alot of stuffing about.