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Infrared paint stripper or chemical stripper or poultice. Infrared is my weapon of choice these days, you can get a cheapish one from eBay or a fancy one from speedheater. I wish I'd had one 20 years ago, very good tools. Use them with a contour scraping set, there's a UK version of the Hyde Contour Scraping Set available for £15.
You can get the job done with a contour scraping set on it's own. It's more time consuming obvs.
I've just stripped the bannister in our flat of multiple coats of paint. The problem is there is a dark varnish underneath it all which is very dark and messy. I can sand off the flat sections using a mouse sander but the detail is pretty hard to get into.
Any ideas?