@MGG I'd bet my last dollar that the stuff on the right you pictured will hold it together for making the WPA attachment.
Those 2 part putty mixers are no joke I've literally never had one fail, even the ones that are on underground lines under shitty ass roads.
Check out this old combustion bong that got wrecked at a party but was fixed, the joint broke off and the base was left with a massive crack which leaked water severely.
Now it works fine and does not leak and even after using harsh cleaners(ISO PBW Acetone) the putty is still in place rock hard.
The crack in the base slowly over time has extended past where I originally puttied it, But sine this sees little use I have't gotten around to buying another stick and putting more putty over it since it's not leaking.
Its not very easy to work with tho, my advice to make it smoother (rather than finger printy like you see on the joint) is to mix the putty with your hands gloved, then once it's active and uniform color swap to new gloves or bare hands.
Mixing it makes your hands sticky and then impossible to cleanly and smoothly apply the putty, you need a clean slate but will NOT have time to wash your hands.
Also let it cure a day or more and apply outside, the putty releases some harsh fumes when you mix it and as it cures.
So yeah, I would bet my last dollar that stuff will hold your 2 parts together fine.
