That's a cool flag, and the whole thing reminds me of one of the first Europa Universalis IV games I played (a very fun game at that, one of my favourite Europa Univeralis campaigns) where I played Moscowy/Russia and colonised the Philippines. This isn't a realistic scenario in the slightest, though. Most every colonial power is more plausible in the Philippines than Russia, really. You have to keep in mind that until, what, the 1860s, the main Russian port on the Pacific, Okhotsk, was utterly horrible as a port. That's not a place to start establishing a Pacific empire from. For Napoleonic Wars, I'd say they'd probably give Britain the Philippines instead of Russia. After all, Russian presence in the Pacific wasn't strong until what, post-World War II?
I don't think Russia focusing on the East is a good idea for the tsars, especially since they seemed content enough with the Treaty of Nerchinsk for over 150 years OTL. They'd rather focus on dealing with the Turks and then Poland-Lithuania, which makes so much more sense from their perspective. Siberia is just a waste with some valuable furs from their perspective, and the Philippines giving some spices and maybe some manpower and trade ports with China (which they already border) doesn't add much more to the value of what they get out of the Pacific compared to the value they'd get out of buffer zones against Prussia, France, or any other potential European enemy.