I have been experimenting with infusing tea bags in 40% neutral ( usually 2 teabags to 300 ml spirit). Some are very nice - and some have been dismal failures. The flavours can be quite different in alcohol than in water.
Things that haven't worked are:
Chamomile ( as in Twinings Calm ( lime blossoms, mint and chamomile). The chamomile was very strong and overpowering.
Turmeric ( as in Red Seal Turmeric and Blood Orange). Also overpowering. However Higher Living Golden Turmeric was very pleasant.
Cassia ( Twining's Orange and Cinnamom lists Vietnamese Cinnamon in the ingredients - It is cassia not cinnamon). Cassia was overpowering but it will be good for steeping dried fruits for Christmas Cake)
Another unsuccessful version used Twinings Defence ( Orange, Ginger and Cinnamon). Initially it was quite pleasant. I made a batch for a friend to use for dried fruit for Xmas cakes but the flavour dissipated quickly and I had to add some orange essence ( baking section).
Cheers
Carol