Hey Ofi. Thanks for your response. Essentially you are telling me "Tough luck sucker, but thanks for your cash." For anyone considering the Travelin template or the SP Booking module: I have now spent an additional $600 to engage a dev and try out a few third-party booking modules. Still not finished, but I think Solidres is the clear winner. If I am correct and Solidres works, I will have spent an additional thousand dollars on a freelance developer plus multiple modules and plugins. Just to get this abomination of a Joomshaper template to work.
Note: This additional $1,000 does not include the dozens of hours of my own time, or the bruised client goodwill.
Another note: Joomshaper admits its booking module doesn't work. They can't be bothered to support it, but they're happy to keep selling it. What does that tell you about the company's ethics?