Well done, keyhole method is easily doable, and preferable to removing the inlets.
I would flush the system and refill with blue, but thats just me and the debate on coolant is worse than 'what are the best tyres to use'
When you drain the coolant, remove the drain plug on the block, it makes thermostat replacement much nicer when there is no coolant in the way.
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Lest we forget..
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