Something maybe worth noting is that if Byrd ran a rogue regional segregationist campaign, there's a real chance that he could win enough of the south to push Long off the top 3 electoral vote getters which would completely exclude him from consideration in the House if nobody gets 266 EVs.
It's sort of up in the air as to how much of a shot we really have at winning the election outright. There appears to be consensus on NY, Penn, and NJ, so that plus New England is 140 EVs. Let's be generous and say that the coalition ticket is able to overcome or co-opt enough elements of EPIC in California and that Seattle isn't by itself enough to overcome the rest of Washington for 3 safe states. That's another 35 EVs for 175. Then we'll say that the plains states with no part of the Rocky Mountains and the accompanying mining union population are also safe, North Dakota, South Dakota, Nebraska, and Kansas for another 24 EVs. for 199 EVs. Let's also say that Olson's home state of Minnesota is safeish at 11 electoral votes for 210.
Beyond this I don't think it's reasonable to consider anything safeish so I'll speculate in what I think is a descending order of likeliness that can be won.
I think Maryland is a reasonably sure pickup, while it's character is still far more southern than it is today, it also isn't dominated by the same sort of courthouse cliques and the city of Baltimore by itself changes the balance of the state to be significantly more northern and industrial outlook and with this very progressive platform I feel that unless the SPA has complete control of the Baltimore which I find unlikely given the relative lack of a political machine existing at all in Baltimore in comparison to Tammany Hall or the Daley family machine, Maryland's 8 EVs can be counter for the Unity ticket for 218 EVs.
Iowa has a similarish character in the agrarian portions of the state to Minnesota albeit without the Arrowhead mining interests and the twin cities. I think with Floyd Olson at the head of the ticket and his background in the Farmer-Labor movement, I don't think Long can compete at all and I think Olson has a very good chance of defeating the more industrial interests of the SPA in Iowa for another 11 EVs for 229 EVs.
The remaining 37 EVs that would be needed to win are really dependent on this turn and the next. If Byrd bolts, we can probably say goodbye to the whole South to either him or Long. if that doesn't happen 3 or 4 Southern states would push us over the edge. The forces in the border states are so divided that regardless of what happens they'd be either 3 or 4 way tossups(Oklahoma, Missouri, and Kentucky). The Rocky Mountain states probably aren't tossup but it's really hard to discern their orientation without knowing the extent to which the SPA has been able to win over union interests in those states. There's also the uncertain political orientation of the Mormons in Utah, Idaho, and Wyoming who may very well be inclined to throw in with the AFP. This is also a sufficiently progressive platform that a misstep by Reed could conceivably result in the more right wing portions of the SPA coming onside to the coalition throughout the campaign with particular note towards Wisconsin(12 EVs) and Indiana(14 EVs), Wisconsin due to the historical success of the La Follete family in maintaining the Progressive Party's control of the state government for about a whole decade around this time and their truce with the SPA in Milwaukee, and Indiana as being far and away the most conservative single state in the Steel Belt.
Overall, even if Byrd bolts, I think there's better than even odds of being able to win the election outright.