Hi Partypooper,,
you clearly stated that the combined SR of the 2 combined is 29% so it`s treated as a single bet ,wheather one or both get up ,it`s included as a single bet ,therefore the stats remain the same.

E.G.
8 race program would equal 4 double bets .
Assuming a SR of 29% = 1.16 wins, regardless whether one or both get up ,it only affects the return for that single double bet not the SR percentage.

It`s a pretty good way of betting .
One can possibly Dutch bet this method if one was inclined.

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Cheers.