Ideally, the best time to repot is when there is new growth with roots starting ... That said, it should be fine to repot now, even if that's not the case.
The spike won't do anything more, so you can cut it, or not - It doesn't hurt anything either way.
I don't know what your summer temps are like, but it should be fine outside in summer - just keep it out of hot mid-day or afternoon sun. It can probably take a few hours of morning or later afternoon light (as long as the afternoon isn't scorching hot). If the amount of light it will get outside is more than it has been getting inside, make sure to gradually move it into the brighter light spot.
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