Japanese manufacturer, Figma, will be releasing their Big Chap action figure sometime in the near future.  Rather than strictly adhere to 100% accuracy, their articulated figure will be more stylised in appearance.  Looks neat though.

Here’s Figma’s website with more information.  You will need to be able to read Japanese.  So I have no idea when this will be released, how big it is (around 6 inches, by the look of it) or how much it will cost.

UPDATED:

AmiAmi Character and Hobby in Japan have posted details on pre-ordering this figure.  Here’s the details from their online store.  It is expected to be available in December 2018:

From the classic sci-fi horror movie “Alien” comes a figma action figure of an Alien specially designed by sculptor Takayuki Takeya! The figure has been sculpted with careful supervision by Takayuki Takeya, and painted by Takeya himself!
– The smooth yet posable figma joints allow you to act out a variety of different scenes.
– A flexible plastic is used in specific areas, allowing proportions to be kept without compromising posability.
– The lower jaw can be opened allowing the iconic inner mouth of the Alien to be extended outward.
– A Facehugger is included as an accessory. It includes both a straight and rounded tail to switch between.
– The Alien’s tail features articulation at the base as well as at two points along the tail allowing for various poses.
– A post card featuring Takayuki Takeya’s original design illustration is included with the figure.
– An articulated figma stand is included, which allows various poses to be taken.

Some more photos for you:

-Windebieste.