Dear Andrew,
should be a very straightforward thing to do. Put your data into a format like this (site x method):
Site Method1 Method2 Method3 Method4 Method5
1 0 1 0 1 0
2 1 0 1 1 1
3 0 0 0 0 0
... and so forth, with one line for each site
And then you define a factor that distinguishes occasions, which here stand for the 5 methods. The occasion-specific detection probability will be the p for each method.
Note that there is only a single occupancy, since this characterizes the true state, which is not affected by your method of observing it.
Best regards --- Marc