I see what you're thinking, was a little shaky to get a clear image at certain points.... but I don't think it's as bad as you think.
Around the 1:20 mark, you have the IO bracket almost in place - the tabs at the bottom need to slip down between the motherboard & the case itself. Work on fitting those into place, and you should be fine. Doesn't look like the backplate interferes with the audio jacks.
You definitely have slim margins to work with - but it
should fit.
I upped the video. Only thing i think of is removing the bracket and letting the card sit in the slot without being screwed to tbe chassis of the computer. Until i get another mobo or case. That wont be a problem, will it?
That certainly could be a problem, yes. I would not suggest doing this.
If you lay your case down, it might be ok....
in theory. In practice, the card will move, which will put strain on the PCIe slot & PCIe connector on the card itself - that may cause irreparable damage to either/or/both.