Like KenK, While I'm not a Dr, I played a Medical Officer on the USCGC DRUMMOND,

the blood thinning effects of 87mg of aspirin daily is generally not going to cause a serious coagulation problem from a large open wound above what would be naturally occuring because it is a large open wound. This First Aid problem is best treated with a large or medium battle dressing.
The problem is that very few large or medium battle dressings are available to the general silly-vilian public. This is why God invented the old fashioned OB pads. I recommend everybody carry 2-4 of these pads in their FAK's. Once you apply one to a serious wound, don't remove it, just keep adding another one on top of the last one until you make it to a medical facility and/or qualified licensed Dr.