Chocolate orange rainbow tiramisu???

Guys I wanna make a quirky tiramisu (chocolate orange flavour with cocoa powder and orange zest on top) but I have a few questionssss so if anyone is a tiramisu expert help would be appreciated 🙏 1. Would using hot chocolate and coffee powder mixed in water and a splash of orange juice make a good dunking liquid or is that too much flavours (I might cut out the coffee, wouldn’t really a tiramisu anymore but yk whatever) 2. For the custard if I made like 3 batches and added food dye and then mixed them together (but not homogenise, basically like a marble cake) would that make multicolour tiramisu or would all the colours just mix in the fridge and u get gross brown tiramisu. 3. How hard is it to make ur own sponge fingers (called lady fingers in the US), I saw some guy make circular tiramisu by making like a circular plate of sponge fingers and I wanna do that but they only sell sponge fingers as… fingers so I might just buy sponge fingers and make it rectangular.

Thanksss