A cute handmade farm tractor wax warmer will be a great idea, and he do the aromatherapy by using it along with doing yoga. You can check with this idea with the following link: https://www.amazon.com/dp/B0BHSXT83Y?ref=myi_title_dp
Hope it can provide you some helps ; )
Maybe a handmade wax warmer will be suitable for her. It can provide aromatherapy in the massage therapist and the spas. The reason why I recommend below to you is that this handicrafts is made by hand, much speciality.
--------------------------------------------------------------------------
New Farm Tractors Wax Warmer for Scented Wax Melts, Spa and Aromatherapy Ideal Gifts & Decor (Vintage)
Price: $22.95
Enhancing your aromatherapy experience ~
Buy them by Amazon
https://www.amazon.com/dp/B0BHSXT83Y?ref=myi_title_dp
--------------------------------------------------------------------------
Handmade wax warmers store page below
Sharing one of my favorite vintage farm tractor wax warmer Amazon shipping link below ~
New Farm Tractors Wax Warmer for Scented Wax Melts
Price: $22.95
https://www.amazon.com/dp/B0BHSXT83Y?ref=myi\_title\_dp
Enhancing your aromatherapy experience in winter ~