I like the way you think…but I would have a slightly different approach.
I believe that the perversions that LGBT people engage in are Satanically driven and as such I would set my little bakeshop up as the most God loving and inspired bakery in the city. I would perhaps give it a Christian name… The Lord’s Table bake shop perhaps, and being catholic myself I would affix crucifixes to the walls and perhaps paint the walls in gospel scripture. When the people who glorify in their perversions demand a cake from me ( and I believe they would hate being in my bakeshop but would come anyway) I would bake that cake with holy water… they would either choke on it or be converted, perhaps both.
” I would bake that cake with holy water…”
Excellent idea.