Having spent a long time in the marine engineering industry, extracting engine lube oil via the dipstick tube, or on some engines via a pump-out pipe that is usually a banjo fitting threaded into where the sump plug is fitted on the industrial version of the engine is completely normal, and doesn't cause any problems. Any old oil remaining in the sump, pipes, and oil galleries is just diluted by the fresh oil.
And yes I've got a Lidl electric pump - I use it for pumping oil out of various mower, chipper and dumper engines, and very good it is too.
A modern solution to the understandable aversion to removing the sump plug on a vehicle - hot oil running down your arm etc- can be avoided by using a drain valve fitting in the sump plug hole - there are many types and manufacturers, here's just one:-https://www.quickvalve.co.uk/
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