Pinching off the spike may actually cause the plant to expend even more energy by trying to branch the spike after the break and/or producing a new spike.
If the plant is doing fine then I would let it bloom...let it do it's thing because pinching off the spike isn't going to cause it to immediately switch to another function. If it doesn't branch/produce another spike then it'll likely just sit there until whatever trigger causes it to move onto the next phase of growth.
IME, a plant isn't going to spike/bloom if it doesn't have the energy to do so. If it's healthy and strong then it will have reserves to continue past the flowering phase.
Here's my question...where did so many people get the idea that a phal can only do one thing at a time? (spike, leaves, roots) ?? It's not unusual for phals to do more than one thing...or all three at the same time...not unusual at all. Some species (hybrid containing certain species) might only do one at a time but many, many, many of them most certainly do more than one thing at a time.
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