If you delete the device you will lose history. Nothing can be changed about that.
You could archive all Insights before deleting the device: [APP][Pro] Archive Insights - export all your Insights data to a NAS, FTP or web folder
Also I would advice to make a Homey backup first, so that you can revert to the situation before deleting the device.
If you dont delete the existing PBTH device, and just create a new (second) PBTH device, you will keep the existing PBTH history. But since the source device will be missing, the PBTH device will say it is unavailable. Insights should be there though. (I think ,but cannot guarantee anything 
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