Epoc

I know i have a first gen, but i figured someone in this forum might know the answer to this.

I purchased a set of obx headers about 4 months ago. I started to get a loud exhaust leak and when i looked to see where the leak was coming from and i had two holes where the welds broke (the bracket that attaches to the rear of the engine block). I'm getting that welded sometime this weak and for now i am putting on my stock headers.

I wanted to know if i could put a bolt in the place of the lower o2 housing because the o2 sensor is still on the obx headers and i wont get those back for a few days. I know that the check engine light would come on but would it really do any damage?
I would only be putting on about 50 or so miles until i could either put the o2 sensor in or put the obx headers back on.