Its hard to say.
If heat becomes an issue moving them away may help.
If heat is not an issue it could save you money because your tank heater would come on less often.
Do you think running pipes next to the boiler is a bad idea? I do not think it will melt the pipes but it could add allot of heat to the tank.
this isn't a Mars mission, just pop the holes in the wall, foam them to seal them, wrap the pipes with insulation if you're nervous about the heat and post a pic of your tank flush against the wall. It's maybe a 30 minute job at this point. You could have water in it tomorrow.