One approach would be to target a race were the other 2 horses total $12.00+ once both prices are added together, after saving on the Fav.
Otherwise no bet race.

E.g.
1st-3.00
2nd- 5.00
3rd - 7.00

This would be a bettable race because the 2nd & 3rd selections add up to $12.00 in price.

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Cheers.