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Not sure if stupid question or not, but is there any danger if lightning strikes outside while you're grounded indoors? E.g. while wearing a grounding strap to work on some electronics project

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The danger occurs when a human body is touching surfaces at different potentials. In fact, shorting all electric points together during a strike (using gas discharge tubes or something else similar) is the way to avoid accidents. You could ensure that the same applies to you when you're grounded - that is, anything else you're touching is also grounded.

Not if you add a highly conductive strip going from the location of the strap to the top of your head (lightning will take the path of the least resistance by approximation; make sure that the resistance is orders of magnitude lower than the resistance of your body).

Note: it might take away the positive effects of the therapy, as there is now an antenna to ground that takes away the "antenna effect" of the body.

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