If you don’t like the LH levers you could always have them changed to another brand that you do like. A harp repairer/maker would be able to do this for you. You are not stuck with what comes standard.
If you don’t like the LH sound why stick with it? There’s more choice in the harp world and it’s better to have a harp you love the sound of than one you merely tolerate.
I don’t really agree that if you want to go to pedal harp someday that you necessarily need a small harp that has the same spacing and tension as a pedal harp. Making the adjustment wouldn’t take very long at all, your fingers would learn amazingly fast so why limit yourself? Many harpists play pedals and lower tensioned celtic harps. They manage just fine, you would too. Technique is not significantly different.
Get the harp you love because they’re not cheap and you won’t be satisfied with anything less.