Didn't neobrain say last time this was suggested that you just needed to put copies of the DLLs dolphin relies on in the folder dolphin is stored in, and you wouldn't need the redistributables? That's the whole reason I'd not already done something like this with cameyo.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
