I would argue that unless you’re specifically trying to learn a new language, you should use whatever language you’re most effective in.

If that happens to be C++, use it.

Sounds great, but they’ll find ways around it.
Make a micro-company where they’re the sole employee, and claim any purchase as a business expense.

“For security purposes, the business absolutely requires a 17th mansion to accomodate any employee/s while they reside in New Zealand.”