If you want remote power control of the 430EX, you could use TTL-capable radio triggers (e.g., RadioPopper PX, PocketWizard TTL, Yongnuo YN-622C, Pixel Kings, Phottix Odins), but these might have only limited control over the 430EX, since some of them use the camera menu flash control signals to communicate settings to the flash. For example, with YN-622 triggers, you could only control the 430EX in eTTL with FEC/ratios. You'd have to use a YN-622-TX dedicated transmitter unit in a special legacy mode to treat a 430EX in eTTL as if it were in M mode, and my experience with a YN-622-TX and 430EX/580EX is that it doesn't work as well as using an actual menu-commandable flash. There are, however, lower-cost 3rd-party units that can be menu-controlled.
With the L308S meter, the manual gives two ways that you can measure flash illumination. The first is to hook up a PC sync cable or radio trigger connection between your lights and the meter. Many radio trigger transmitters have a sync output port of some kind. You can cable that port up to the PC sync input on the front of the meter. Then, you press the Mode button to go into corded flash mode, set your shutter speed, and press the measuring button to set off the flash and have the meter make a measurement.
If you don't want the meter to trigger the flashes, and you'd rather set them off via a trigger test button or the camera shutter release, then press the Mode button to set the meter into auto reset cordless flash mode. The mode mark will blink, and you've got 90 seconds to set off the lights for the meter to make a measurement.
See pages 14-16 of the L308S user manual.