e-ras-e

I have an HTPC that I also use with my Oculus Rift headset. It sits under my TV-bench the rear IO is not accessible at all. Because of this I have made my own solutiuon for plugging in the VR-headset. I have routed an HDMI-cable (male-female) from the rear IO of the graphics card to the front panel where I made a hole and glued it in. Recently the glue failed and today when I opened up the computer to fix this I accidentally broke off (first it got bent and when I tried to bend it back it snapped of) one of the pins on the only internal USB 3.0 header on my motherboard. Because of the placement of the computer and what I use it for I need to have both HDMI and USB 3 on the front panel IO. I know I could use extension cables outside of the chassi from the rear IO but I do not want to have cables visible. Do I need to get a new motherboard or is there some way to "create" a new USB 3 header? I have only found expansion cards that give more external USB ports. Does it matter which pin it was? I marked the missing one (bottom right) with red on the attached image. The "no pin" place is top left. If the only solution is to get a new motherboard, does this mean that I have to reinstall Windows and all of my programs?

I probably should have remember to add that I do have an adapter from 3x 3,5mm to RCA and a RCA to single 3,5mm cable (and yes, there is a headphone jack on the tv) so I can use the speakers. However, since a headphone jack only outputs 2 channel audio I can't get 5.1 output this way and I would like to be able to use the speakers to their full potential. Two of the hdmi ports on the TV have ARC (I did not include it the first time as I did not know what that implied) if that makes a difference. The only way I have been able to sort of solve this is to connect the speakers to a PC and plug that to the TV with hdmi. But then the speakers will only work for audio from the computer but not for the regular TV-broadcasts. That's why I want to connect the speakers directly to the TV. As I wrote in the original post I do have an old PC that I could use for parts if that is possible. Even if I will have to solder something together I am willing to do that.

When I bought my new TV (Philips 50PUS7383/12) I thought it would be a good idea to dust of the old, but fully functioning, 5.1 audio system from my old desktop (Logitech x-530). The only problem is that the TV outputs either toslink or hdmi while the speakers have 3x 3,5.mm connectors (green, black & orange) As far as I have been able to find there are no converters that do this. So I'm wondering wether it is possible to frankenstein something together by cannibalizing parts from the old computer or something like that or if I should just give up on this idea.