I think using stomp , HX and an expression pedal will give you most (not all) the functionality of a Helix, with a lot of added complexity, two power supplies (or one big expensive one) cables, programming etc
I have the stomp for bass (3 sounds under my feet and a tuner) but struggling to make it work for guitar where I use a lot more effects, for that I have a Helix. It's big, heavy, expensive but brilliant!
You could expand the stomp functionality with a midi controller, but IMO that detracts from the simplicity of the stomp, and is a bit of a half-baked solution
The HX FX, I personally wouldn't bother with as the amp modelling is important to me
The LT is good value, but I know if I'd bought one I'd with Id spent the extra on the full fat model