Is 2 CSPX.L unit a month via IBKR worth the broker fees etc?

Personally, I think it's not.

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2 shares of CSPX is about 800 USD now.

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To make the trade, you need pay 2 USD to convert SGD to USD and 1.70 USD for commission.

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All in, it's almost 4 USD of fees to buy 800 USD of CSPX, or 0.5% in fees.

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If you want to invest monthly, you can consider using Syfe Trade to buy VOO - its competitive FX rates and free trades make it quite affordable.

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If you're bent on investing in CSPX, maybe consider investing every 2 or 3 months.

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Of course, if you think 0.5% in fees is something you're willing to pay, then by all means go ahead.