Need help with PCIe lanes

Hello, I want to put an Elgato 4K60 pro MK2 on my PC, I have made the mistake of not realizing that it is using an PCIe x4 slot, which changes everything.

I had assumed the card was an x1, and I could use it on any x1 slot on my motherboard, but I can't, thankfully the B450 Steel Legend that I use has a second x16 slot, so I can connect it there right ?

WRONG ! I use an NVME SSD I bought 6 years ago, and I didn't know that using the M.2 1 slot would straight up deactivate the second x16 slot, so I have a problem, and only two choices for me (considering I also use the second M.2 slot for another SSD)

I can either get a x1 to x16 converter for the Elgato, or I can get a x1 to NVME, that will activate my x16 slot (right next to my graphics card as well lmao), what would you guys recon is my best option ?