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I used silicone to adhere the secondary mirror to the holder of my 10". That was done in 1996. Still there and no sign of giveing up the ghost. Remember also that your gear is not left outside in the elements to accelerate the deteoriation of the goo. No little fingers reaching around onto the silvered surface.
If you are looking to make a temporary fixture, the same goo could be used to attach the secondary to the lip of the holder shown in your picture below. A bead all along the lip. If you would like a little more mechanical retention, drill a series of little hole close to the lip so that the silicone reaches through these holes back onto itself.
I suggest this material and method as when you are ready to fit the heating element, the silicone can the cut to free the two components. As the silvered surface of the secondary is not the face being glued, you don't need to fear damaging the precious surface. If you already have the aquarium goo, see that it will adhere to the metal. Usually not a problem.
Alcohol wipe and a good dry is a good idea, and won't affect the bond.
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