I like the way you think :tank:
Yup... I did a quick Kitchen Lab test and added 30g of HB Brown and then made 3 samples adding in 1g , 2g and 4g of spiced Oakheart Rum...
1g makes a 6% abv beer... very subtle
2g makes a 8% abv beer... about right
4g makes a 10.5% abv beer... maybe too much for...