Did you look at this thread ?
Of course it’s going to be messy, not sure if inverting the AK makes it messier ?
Keep in mind reassembly is generally the more difficult part. Document the disassembly, and be careful to keep parts, like in a jar or something.
This person, i think, removed all the screws in the bottom at once.
An alternative approach would be to do this in two separate steps. In the first step only remove the screws attaching the upper shroud to the base, leaving the screws attaching the keybed to the base in place. You should be able to pick out the eight screws that attach the keybed visually, and leave those untouched at first. Then separate, the upper part from the lower half, with the bottom plate with the keybed still attached. Careful with the ribbon cables.
In your case you are going to want to detach the keybed as well, so either method would probably work.
Be aware, i think reassembly will be more challenging to replace all the screws at once, trying to get everything aligned. Attaching the keybed to the bottom plate first, and then attaching this bottom assembly, may be easier for reassembly. You’ll need to decide which approach fits for you.
Reminder: You are dealing with an unknown substance, so safety first, gloves, proper disposal, etc. Proper grounding for you, like with a wrist strap, is recommended if you are handling things with electronic components, to protect them from static discharge.
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My first reaction to anyone with this oil problem, is to be reassured by Elektron’s statements. I’d probably come down on the side of “If it ain’t broke”, rather than “A stitch in time”, but if you’re bold and experienced, have at it.
ADDED: Thinking about this some more. If the source of this oil is really from the keybed mechanism, it likely is falling first on the keybed circuit board (the beige colored circuit board in the pictures) before making its way to the bottom metal plate. If you also want to clean the top part of this circuit board, the process of detaching that’s c.b. from the actual keys and frame will be much more involved. I’ve never done this sort of thing myself, so you’ll need to evaluate this challenge before proceeding. You may decide this extra step is the bridge too far, and be happy with whatever mitigation you’ve already accomplished as being enough.
Also if you’ve gotten this far you can consider any other maintenance / tune up you may want to take with the actual keys themselves, i.e. lubrication, cleaning, inspection.