MacBook Pro 2011 (early ) 15 inch. M.2 NVMe SSD

I have a Samsung Evo 860 SSD installed in optical drive bay with a SSD caddy adapter, which support up to 550 MBps read and 520 MBps write speeds.

I was trying to install a M.2 SATA based drive using a caddy adapter on Amazon (SAT32M225)

1) I found that most of the NVMe drive are PCIe based, which are not compatible with (SAT32M225)

adapter. Read the warning in photos.

2) Also, I found on the MacBook Pro 2011, both the main drive bay and in the optical bay have SATA III connection of 6Gb/s, which can support max 600 MB/s.

Since the SATA III connection cannot support more than 600 MB/s., There was no point to install the M.2 NVMe ( whose read/write speed 2000+MB) is not possible on SATA III connection of the optical or main drive on MacBook Pro 2011.

Also the M.2 SATA ( Not PCIe, which are faster ) based drives have the same read/write speed as the standard 2.5" SSD.

I was wondering if there is anybody, How had found a better solution to a faster than 2.5" internal SSD drive solution for 4k Video capture and editing ? Do you think a thunderbolt drive or Firewire drive will provide a faster than 2.5" SSD read/write speed ? Thanks.