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To solve this problem, I would consider writing a Python script that takes into account the special spelling rules for English numbers. Here's a general outline of how this could work, then I'll provide some code.

Create functions to convert single, double, and triple-digit numbers into their English word equivalents.
Loop through all the numbers from 1 to 600 (inclusive).
Convert each number to its word form and count the alphabets in each word form.
Keep a running total of the alphabets counted.

//python code

def convert_single_digit(num):
    single_digits = ["", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",
                     "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
    return single_digits[num]

def convert_double_digit(num):
    tens_multiple = ["", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
    if num < 20:
        return convert_single_digit(num)
    else:
        return tens_multiple[num // 10] + convert_single_digit(num % 10)

def convert_triple_digit(num):
    if num == 100:
        return "onehundred"
    else:
        return convert_single_digit(num // 100) + "hundredand" + convert_double_digit(num % 100)

def main():
    total_count = 0
    
    for i in range(1, 601):
        if i < 20:
            total_count += len(convert_single_digit(i))
        elif i < 100:
            total_count += len(convert_double_digit(i))
        elif i <= 600:
            total_count += len(convert_triple_digit(i))
    
    print(f"The total number of alphabet characters used for numbers from 1 to 600 is {total_count}")

if __name__ == "__main__":
    main()


// python code ends

Expansion of Code Requirements:

One thing you could do is generalize this code to handle any range of numbers, not just 1-600.
Another useful feature could be handling decimal numbers, although that may complicate the counting logic.
You could create a web application where users can input a range, and it would use an API to return the total number of alphabets required to write all the numbers in that range.