>>3559There is a phrase in the Pali Canon that is used frequently that goes something like "the Buddha teaches a Dhamma that is good in its beginning, good in its middle, and good in its end" and this is exactly why you might want to leverage the ideas even when pursuing other goals.
We can look at what the "path" actually constitutes:
1. Right view: you actually believe the four noble truths accurately describe reality, or at least you believe it instrumentally if not wholeheartedly. This one is useful for the path but probably not much else.
2. Right resolve: while holding the above belief is good, it isn't enough. You must also resolve to act more skillfully. This means looking at your own thoughts and actions and see which are beneficial to you in the long run and trying to do those more, and looking at what is actually hurting you long term and doing this less. This is basic introspection required to get more skilled at anything, obviously transferrable to any goal.
3. Right speech: only saying what is true, timely, and beneficial. Again, if you are conditioned to telling lies or speaking harshly to others, you are most likely doing the same when speaking to yourself. You may believe you can separate the two, but I believe there is a reason most Aryan cultures held the truth so highly.
4. Right action: no killing, stealing, fighting, or sexual misconduct. In pursuing most any worthwhile goal, these will either directly hurt you if you get caught, or they will indirectly hurt your ability to face yourself when you look back on your life to attempt to improve yourself. You will learn to shy away from introspection and thus hide from reality. This is important because it is much closer to virtue ethics because it is much more about not taking action that you will shy away from than it is about some divine punishment. Again useful for other goals.
5. Right livelihood: like the above think about this with respect to virtue ethics. A means of supporting yourself is bad if it turns you into a lower kind of man, and good if it is honest and you can face reality more clearly. If you must contort how you interpret reality in order to face your job each day, you are just cultivating delusion and will probably not be effective in most higher pursuits anyway.
6. Right effort: you generate the desire to do the actions that get you to your goal. This one is necessary for any long term ambitious goal. If you don't have desire to end suffering forever, you will likely never reach it. This is contrary to people who say you must give up all desire, which is dumb. Desire is strong, and the Buddha advocates directing yours to a good goal. Maybe in the end you drop it, but you don't throw away your raft before you finish crossing the river.
7. Right mindfulness: literally the ability to hold a thought in your head and remember it consistently when doing other things in your life. For the Buddha's goal, it should be the four noble truths. For another worthy goal, it should be whatever is needed to believe in order to achieve it.
8. Right concentration: this is the only step on the path that is specific to the Buddha's goal. Concentration is a single minded focus on one object that takes you into ever more refined and enjoyable mental states called jhanas. The idea is to cultivate the skill of getting your mind into these states because it is a pleasure that does not depend on any outside factors and doesn't harm anyone else in its pursuit. The Buddha uses it so that you can more confidently drop the desire for other things that are hurting yourself or others in your pursuit of them. Could be useful for other goals, but the case would have to be made.
So to me it seems like 6/8 of the steps of the Buddha's path will be instrumentally useful for any other goal as well. It also doesn't require you to risk "wireheading" yourself with practices to cultivate different mental states. Instead it just aligns your thoughts and actions in a way that allow you to more fully direct yourself towards a noble goal.