Isaiah 44:24 is NOT referring to any specific Person.That's not what BDB says. The phrase is "of origination." The Greek uses a preposition that means origination, από (from). The same concept is at 1 Co 8:6 where all things originate with the Father using εκ (from) and through the Son with δια.
So all things do originate with the Father. No things originate with the Son.
Since God at Isaiah 44:24 is originating all things, He is described as doing what Paul says the Father does at 1 Co 8:6a and what Jesus says he cannot do at John 5:19 and 30.
So Jesus is not YHWH at Isaiah 44:24, it can only be the Father.
In fact Isaiah 44:24 is only referring to what the Father did. That does not mean he did not use an agent during that process.:
Look at verse 28. He used Cyrus as his agent to restore Jerusalem but he alone was the cause or origination.
At John 5:19 Jesus says He NEVER works independently of The Father.
BTW Jesus is The SON of The Father, NOT an agent.
The Father and Son are ONE. John 10:30.