Diverter or separate pipes?

Hi there everyone,

I am in the process of building a bathroom on the third floor of my house. There wasn't a bathroom there before so I
am not dealing with any existing plumbing issues.

I was originally going to do a walk-in shower but a friend of mine who is an interior designer has convinced me that I should
go with a tub as it will add to the resale value of the house. I have decided that she is right and will probably go with
a Kohler drop in tub that has an integral tub flange.

The problem is that I have already purchased the shower hardware and I can't return it. It is a Hansgrohe showerpipe with an exposed
thermostatic valve. Plus I really like the look of it and want to use it.

[h=1]Hansgrohe 27160001 Raindance S[/h]
So now that I have decided to use a tub instead I will have to have tub hardware. What is the best way to plumb this? It doesn't make sense to me to have a diverter from the bathtub faucet since the thermostatic valve is built into the shower pipe. Should I just tee off the hot and cold lines and plumb the bathtub hardware and shower hardware separately? Or is there some other solution that I am not thinking of. The idea of having the tub and shower supply lines separate from one another does not bother me. I would rarely use the tub anyway.

Thanks in advance for any suggestions.

If I spent over $1000 on a shower kit and couldn't return it I'd want to use it too. It's been a while since someone replied. Maybe there is a way to put a diverter into your shower pipe? If you did the job already what did you do?