v8-radiator hose replacement tips needed

[Elekta]

It's the one on the passenger side. It looks pretty simple to replace, but I have a question about not losing the precious blue fluid. I have a decent spring clamp to stem flow, and will remove the lower end into the radiator first. But into what? It's just the hose r&r and I know I should do the water pump and thermostat, but it's not going to happen today.

I have a decent tray to catch the fluid, but I guess I need a funnel with flex hose attached to direct the fluid back down the header and into my pan.

Any tips for this almost-never-DIY-er? For this op, is burping going to be difficult or can I just turn the heater on, and remove and replace the cap a few times.

Thanks so much in advance.

geoff