I think there is a lot you can do with that 3DHS plane. You will probably get bit of tail wag in some maneuvers, but no reason you can't learn the basics of precision flight with it. If anything it might make you a bit better with rudder control. Set the plane up with nice low rates and a forward CG and start practicing your straight and level flight and making corrections.

I know a 2M pattern plane helps, but the best pattern planes on the planet don't make corrections for you. I've got a 1.10 size pattern plane, it is more than adequate for learning to fly precision. When I'm confident I'm making all the right corrections (and at the right time), I'll move into a 2M bird.

You will come across the right plane at the right time