There are no set rules with any technique. It's not exactly 'forbidden', it's just that for most people, it has an undesired effect. But it's always different for everyone, and the best way to know what works is to try everything. As for the electronics usage, the main reason (i think) is the exposure to light. See, when we are exposed to light, our body immediately decreases production of melatonin, which is the chemical that naturally makes us sleepy. This is why we naturally feel sleepier at night, since we are less exposed to light so melatonin increases, and we feel sleepier. Anyway, even I use electronics during WBTB, i just make sure to keep the brightness really low, and avoid turning on any other light sources in the house. This is true for many other lucid dreamers, so don't be afraid to try it as it may not even ruin your attempts. The worst that could happen is that it will keep you up, but then you'd learn not to do it next time. Win-win. Plus, using that WBTB time to read about lucid stuff could potentially help get you into the right mindset.
Regarding the counting and drifting off, i would suggest using another WILD anchor—perhaps white noise, breathing, mantras, or visualization, whichever you prefer. Some anchors work better so it's best to try them out and see which suits you and helps you stay aware more.
Lastly, my vacatiooon... Well I went to this other island in my country, it's called Palawan. You can do a quick google images search to see what it looks like (ignore the blue people that show up in the results lol)

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