Thank you Ryan ........... p.m.'ing you was next on list of things to do.
It is funny , I was trying to wrap my brain around possible fixes and was going to look at plunging in the 3/4" hole with an end mill to create a seat , then use a threaded sleeve to seal it off and drill from the back of the block to restore the oil path.
But I am both excited and relieved to hear your fix.
It sounds too easy .......... which puts it within my range of skills.