The Haymaker "Enrapturing Glance" says that this can also be used outside of the ring with a successful Moxie check. However, the Requirement to acquire the Haymaker is having at least 17 Moxie and considering how rolls are resolved, it's been long impossible to fail Moxie rolls at that point. In fact, every Moxie roll is a Perfect Success by the point you can acquire it.
I feel like stat requirements for Haymakers are not well-thought out in general. "Brittler" and "Best in the West" are mathematically-impossible to be acquired before Level 10 and those are Level 5 Haymakers. "You're Already Dead" is impossible to get before Level 15 and it's a Level 7 Haymaker. All but one Level 20 Haymaker cannot be acquired before Level 35 assuming maximized stats and level-up rolls.
Tempted to houserule that stat requirements for Haymakers are halved (rounded down) so they're realistic to reach at their levels if one has some luck with their levels and focus their build towards it.