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I don't know if there are any specific rules for delta wings but they are fundamentally just large vortex generators so any sharp edge at incidence to the flow will act as one.
I don't think either Gurney flaps or endplates will be of use with delta wings since they rely on separated flow around the leading edge of the wing to generate the vortex whose low pressure core provides the lift on the upper surface of the wing. Endplates are there to limit flow around the edge of a wing and so would negatively interfere or even destroy the mechanism by which the wing generates lift.
Gurney flaps aid flow attachment on conventional aerofoils by reducing the base pressure and hence the pressure gradient that must be overcome by the boundary layer on the suction surface. If anything you would want them on the opposite side for a delta wing to provide a pressure gradient which would *prevent* re-attachment and so maintain the free vortex.
Apologies if you already knew all of this.
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