For the push button switch could use a headlight dimmer switch like Alange says on the floor or they make push button dash switches that work the same way - push once make contact, push again break contact. One way you could wire up the three other functions withoug going to a relay is to wire three single pole toggle switches to control the functions, similar to what you have. Then wire a triple pole toggle or rocker switch IN SERIES with the three switches. Then in operation leave the three single switches in the on position all the time unless you only want to shut one of them off. Most of the time with the three switches left in the on position just use the triple pole switch that is in series as the "master" switch to turn all three circuits on and off. The tripple pole switch keeps all the circuits isolated from each other but turns them on and off at the same time all at once. Kind of like a 220v breaker breaks two 110 circuits at once.

john