If pouring gas down the carb concerns you, might I suggest a can of starting fluid? The start fluid has lubricant which is an advantage. To use gas, simply pour a a little into the carb. It will sit in the bottom of the intake manifold and draw into the cylinders when you crank. Don't over do it. A small drink bottle with a 1/16" hole in the cap works well.

You could purge the fuel line by applying power to the pump with the fuel line disconnected or cracked at the fuel pump inlet. Be carefully and clean up any spilled gas, a helper would be good. Then, you can crack the fuel line at the carb, and spin the motor till you see fuel. Now your fuel lines are purged.

A splash of gas down the carb should spin the motor until the bowls fill and then it's running on its own.

Be mindful of a backfire. Be careful to have timing set before you start the engine. No spilled fuel on the engine, that's a real recipe for disaster.

In case of a backfire causing a fire in the carburetor, don't panick. Usually you can "suck it out" by cranking the engine.

Anyway, work safe and good luck.