Thank you Hank for an update. It’s sad to learn you can’t do it, but I like your openness.
I suggest that you look at Texas Commander driver. It’s in a beta state. And may not deliver the current that you need. But using Led4Power trick of putting the FET on MCPCB should solve the issue and make it easily handle 5A, probably 8A for 2mm² variant as well. You would still have to put the work of taking it out of beta and into production…but it seems you’re more than capable of doing so.