Transfer offer between lines

I have the "Upgrade & get a Samsung Galaxy S25 on Us" offer on my main line, but I want to apply it to a different line. This is apparently a loyalty offer that doesn't require a plan change or trade-in, which I confirmed by getting to the check-out screen. Is there any way to switch this to a different line? Or do I need to upgrade on Line 1, activate the phone, then transfer eSIMs between lines in the Verizon app while keeping the DPP on the Line 1?