Remove the air filter and put your hand over it while starting? Give it a small squirt of gas?
Is there an accelerator pump circuit? On prior cars with dead chokes I would just keep pumping the gas to keep it going--short, quick pumps, just to make the accelerator pump squirt a bit of gas to keep it running. Only had to do that until it would hold a high idle.
I had a dirt bike with a fuel enricher type choke. It didn't have a choke butterfly in the carb. It increased the fuel to air ratio by bleeding more fuel out the carb when you pulled the choke plunger which wasn't adjustable. That bike was a pain to start under 40F.