I am wondering if this is something that you need to go through to convince yourself? Maybe you are one of the fortunate and blessed people who easily access what they want in life and more. On the other hand, you may find that applying to US firms is neither as pleasant nor as easy as you're assuming.
If this is an itch, you probably need to scratch it. If you can competently apply to US firms without detriment to your undergraduate studies then surely that experience is worth going through, to see what comes out in the wash. If you are worried about it now before you've even embarked on your career, you won't want to look back and think that things would have been different (ie easier, smoother, more rewarding - which they may well not be) if you'd only applied.
And I'd wholeheartedly agree with the comments about income. You are already able to access a highly competitive salary and development of a really valuable skill set, and colleagues, that should set you up for life. The starting salary is literally the 'compensation' for what the commitment involves, and it isn't a decision that is in your hands until you have that other TC offer that you haven't yet even applied for. Whether it's enormous or just plain vast, you will be able to more than meet your needs for the next few years so the ££/$$ really shouldn't be the main driver.
I'd say, scratch the itch unless you figure out that it is not worth the disruption. And if it doesn't feel good, don't do it. Lucky you!!
