beam post not resting fully on concrete wall. 1

There are some pretty big assumptions needed to figure out how to distribute the load from the baseplate between your reinforcement angle and the concrete wall corner. How to estimate the stiffness compatibility between these two elements is the biggest question.

You must observe that right now without doing anything all of the load goes to the concrete. So if you just stick the angle reinforcement in there tight up against the baseplate...
Is it really going to take any load at all? The concrete would need to deflect down for the angle to start working...

One would have to lift up the reinforcement with a jacking force and then lock it into place with the concrete anchors to get it to accept any load.

I think I'd approach it as if additional live load would be carried in the angle, but I'm not crazy about a detail that drills into the thing I'm relying on to carry the column.

Also, it might depend on how much load the column carries, 5 kips or 50 kips, and with the assumption that you've determined that it doesn't work as it it.

I’d assume all load goes into the angle. If it truly doesn’t work then I’d start assuming some goes into the concrete.

Seems reasonable. A few thoughts:

Those sleeve anchors will look pretty small in a 1/2" thick 6" angle. I's use something a little beefier with a little more cover to the corner.
The angle will have an inside fillet which will keep it from seating flush to the wall. May need to round off the concrete corner.
The angle is 1/4" or 1/2"? I don't think 1/4" angles are rolled for a 6" leg. 3/8" might make sense.
It might be a trick to cut the angle post exactly to length so that it bears top and bottom. Maybe size the bolts to carry the entire load into the wall if need be.

How about bolting a channel to each face instead of using an angle?