A taildragger is just as apt to eat grass as a tricycle gear. They both will be level sometime during takeoffs and landings and will cut grass with too long a prop. Put the correct prop on the model and neither one will give you a problem.

Taildraggers often give beginners a problem that trike gear doesn't. It's a problem you really need to consider too. Lots of guys have really lousy takeoff strategy. It's proven in our crash statistics. A huge number of model crashes happen on takeoff because so many modelers firewall and pray. They are often the ones who never learn to use the rudder. They want to get the takeoff over with quickly and haven't learned that rudder helps greatly on takeoffs and is absolutely necessary when the throttle is firewalled.

Learn to roll the throttle in under control and steer with the rudder and you won't need help making your model easier to fly. However, if you want it easier and safer on takeoffs, leave the tricycle gear on it.

As for ailerons... If the airplane is designed without them, it'll teach you to fly with the rudder. You'll be better off leaving the plane the way it is and learn to fly it. While you're doing that, build a replacement wing for it. Building a replacement wing takes the same skills modifying an existing one does. Build a wing that has ailerons and less dihedral than the one you've got without ailerons.

There are a number of things you're jumping the gun on. Get the present plane ready to go without spinning off doing unnecessary modifications. Get out and fly. Once you're flying, try out the other things you want to see work. Your present plane sounds like the best trainer design ever, the rudder/elevator/motor model. Back when RC was new, that layout taught almost everyone to fly. And almost every one of them learned to use the rudder and had no problem with models with more controls later on.