====================================Your concept is good but the devil is in the details.
NONE of the Simpson post bases / column bases are designed /
be used in free standing post configuration (ie a fence post or flag
Read the catalog notes.
A 4x4 post embedded in concrete in the ground has a decent "moment
capacity". To get a fence post connected to a "concrete chunk" via a
metal connector to perform the same as an embedded post requires a
bit of design; especially the fastener size and pattern.
Its not as simple as it appears ....... a moment capable connection;
wood to concrete via metal connector winds up being a pretty hefty
piece of hardware
If you go back and check my post, you'll notice that 10 GA metal
(1/8"+) is spec'd as well as standard 1/2", "J" bolt anchor bolts in
You will need at least a 3/8" inside radius for the 90 degree turn to
minimize stress concentrations. (You need a press brake operator with
a little talent<grin>)
Think of this as a 30 ft tall lighting pole, secured with four (4)
mounting bolts to a concrete cylinder.
The design approach is similar.
I doubt anything in the Simpson catalog comes close to the above.
You will have a better chance finding something in the Valley pole