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G tape is fine. All the tapes I've used can cause problems if you make a mistake while doing the install. If anything, G tape is more forgiving than Yellow, because it doesn't require a clinical-clean rim to install, and comes away in one piece.
Just make sure the G-tape is slightly wider than the rim bed once pushed down, forming a U shape and riding slightly up the sidewall of the rim. Then the edge of the tape is sealed from the sealant by the tyre bead once the tyre is installed and mounted.
I'd not recommend using gorilla tape - it's ok to get the setup working, but causes problems down the line. The sealant can get under the tape and make it unstick quite easily, and, worse, the gorilla tape can leave residue on the rims and tyres which can be really difficult to remove. This can give you real problems with seating the bead.