Got to have salted butter in. Best hot topping is chilli and cheddar, best cold topping is tuna mayo or tuna and coleslaw.
The tuna and the beans must mix together though. So there is potential for a mouth full of fish flavoured baked beans. It’s a no from me.
Sounds alright to me. Reckon tuna and beans works well. Cheddar goes with anything. I'd add grated Cheddar to my tuna mayo one.