Neon Indicator lamp replacement

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To replace a neon indicator lamp in an old flash gun with an LED, the circuit operates with a voltage range starting at 240V and going up to 350V, connected in series with a 1.5Gohm resistor across a charged capacitor. The user has a 4AA battery pack available, which can work with rechargeable batteries down to 4.8V. There is uncertainty regarding the design of the 'ready' lamp circuit, prompting a request for the simplest replacement circuit for the LED. A reference resource for strobe flash repair is provided for additional guidance. The discussion highlights the need for careful consideration of voltage and circuit design in the replacement process.
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I have this neon indicator lamp that I would like to replace with an LED. It is a part of an old flash gun.
The indicator is made to show "charge complete" and I've measured that to start from 240V and keep going until maybe 350V. The indicator lamp is connected in series with a 1.5Gohm resistor and the whole thing is connected across the charged capacitor.

There's 4AA voltage within the pack which I could use, but i use rechargeable batteries, so it should work down to 4.8V

What's the smallest circuit I could get to replace this with an LED?
 
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