Can small supply pipes be combined into a larger supply?

we are installing a shower where two sinks used to be. Is it possible to combine the inbound water (1/2") from each sink into one 3/4" line for hot & cold to feed the Moen U valve we want to use to distribute water throughout the shower?

We will have the following in the shower:

• 2 or 4 body jets
• 1 10" jaclo showerhead
• 1 12" jaclo rainshower
• 1 handheld wand

Thanks for your help.