terms of both cost and facility.
Apart from expensive, Hyperbaric chambers would be incredibly inconvenient when trying to get in and off the field and pay attention to what’s going on.
But what about oxygen masks on the sideline? Pro teams have used them, and they wouldn’t be very expensive.
I have no idea what blood doing costs. But it would have no cumbersome downside on the sideline and may actually be worth it for your best players for that one week if it allows them to play significantly more downs at a higher level. The drop off from some starters to their backups is very significant.