Hahaha stable blood levels with orals. That’s funny.
No seriously, not making fun of the question but that’s a funny theory to me. In a nutshell, it’s impossible. Because orals are digested there are different factors in their bioavailability you just can’t avoid. Like eating, drinking and sleeping to name a few. Even if the orals half life, like Var for example is 6 to 9 hours. Unless you are taking it on an empty stomach and allowing it 2 to 3 hours to digest prior to eating or drinking and you intend to wake up through the night to dose the same then the half life is basically ever fluctuating. You’ll never have “stable blood levels” with orals. Your best bet, as you mentioned, is just to try to get close to overlapping the potential half life. Like splitting your dose to every 6 hours. So 75mg would be split to 12.5mg every 6 hours of the day.