Because of the modern NFL you build a defense from the back/forward. So I wouldn't be as pressed about how guys fit on the Dline. You can figure out how best to utilize those guys. More imporantly is we have an issue a S and CB until we get Adebo resigned. Taylor is your money guy and I'm assuming McKinstry was drafted to be Lattimores replacement.
As Roux pointed out you're looking at a 4-2-5 big nickel as your base defense. So the whole 3-4 thing is being overhyped and overblown. You'll be in that 4-2-5 over 5060/% of the time and you'll be in dime another 20% of the time. You'll only spend about 20% of your time in base 3-4 and another 10% in some other front.