You just made me realize that I actually had everything I needed to fix the problem on the course pretty quick. I didn’t have an extra loose valve core, but I did have my spare tube with valve core in it and I had a tool that included a valve core removal tool. I guess since it took me 2+ days to figure that out, I shouldn’t beat myself up too bad for not figuring it out on the side of the road with race brain. But yeah, I can be dumb. Basically, I wasted 2 co2’s that were barely getting anything in and then had to resort to hand pump which I was able to force air in slowly and the tire eventually sealed.