So, I've got a '92 Bayliner Capri with a Force 70 Outboard, that will no longer start, any suggestions?

It might just be the spark plug but it sounds like you have water in you oil. My advice is sneak out while this misses isn't paying attention and buy a new motor and when she says something about it tell hurt you talk it over with her and she told you it was ok to buy a new on and call it your Christmas present.

Force outboards were pieced together remnants of the bankrupt Chrysler Corporation outboards. Some were good, some were bad. Milky in the lower unit means a shaft seal is probably bad and has nothing to do with the other end which is the power head. Granted, in the lower unit above the gear box is a water pump that provides cooling water to the power head, and it pumps the water your boat is sitting in. Most generally outboards when running have this little tattletail tiny stream of water coming out somewhere near the lower part of the upper housing that indicates the water pump is pumping. Sometimes those also get clogged but still the pump is putting out just fine, but I would be unplugging it just in case. Tiny bugs like those dark holes in the off season.
Good insurance is to change out that impeller every two-3 or so years as they do get hard and brittle, and sometimes worn when running in merky water and shallow waters picking up sand causing abrasiveness. NEVER run the outboard unless there is water at the impeller, you will burn that out so fast.
These are a two stroke engines mix oil at 50:1 in your gas, or has oil injection; hopefully your using non ethanol gas. Ethanol will eat your rubber gaskets, gas lines and make them swell up internally sometimes to the point of them swelling shut.
You stated that the water pump looked ok, so maybe one or more of the ignition coils is starting to break down when it gets warm, but functions off and on when cool. Moisture on the plug could be an indicator of a head gasket leaking or an internal water jacket gasket letting some seeping in.
If the engine has overheated, that can cause scoring on the cylinder walls, the rings can loose their springiness and loose compression. New outboards cost more than my first new car. They've gotten so expensive that some states started treating them as real property and put titles on them.
I worked on them for 30+ years, but like a person working for Boeing, I don't know of one that has their own plane in their back yard. I went to I/O a long time ago and use a small kicker for fishing, that I never do anymore..

Been fishing for 50 years, over 10 years commercial. Force (Chrysler) engines are garbage. Try to get the best trade you can. Your motor is just disappointment after disappointment waiting to happen.