that is the real deal pillar bedding, no doubt. Thanks for taking the time to post all those photos and details. After that much detail, I couldn't imagine why you'd keep the Devcon steel putty a secret (just a guess).
Another good choice might be Hysol EA9330.3.
Regardless, workmanship like these bedding photos can not be duplicated without experience, patience and an eye for detail. That is where the money is. Even the tooling is obviously made with an eye for detail! What was that written on the vise block...??
Your advice about warming the individual parts before mixing is good, plus the mixing on a flat surface for thorough mixing. If the selected adhesive comes in cans, mix the individual parts thoroughly in their containers before combining A&B per the weighed out mix ratio. After all that, if bubbles are a real concern, you can vacuum degass the material in a vacuum bell. It will foam and then subside, at which point the majority of bubbles have been removed. True, more bubbles can be introduced during adhesive application.
Good release agents are MS122 and Frekote 700NC. Bonded-in components (like pillars) should be thoroughly cleaned with acetone or IPA prior to bonding.
I've never bedded an action but I deal with critical bonding processes daily at work, as a manufacturing engineer in an Aerospace composites shop.