The oil I used so far is common 2-stroke oil used with homebrew fuel. I do not expect the rubber rings are affected. The only rubber ring is indeed the one in the carb shaft.
I do not think these silicone rings are affected by any kind of oil but you can always take it out. Most onroad engines have a metal shield in the front bearing. The seal of the front bearing is placed close to the cover and is above oil level, also the large hole where the crankshaft is comming through is giving some cooling.

From the original Dutch Break in guy I haven't heard any issues with the seals and his construction has the front bearing totaly covered in hot oil. I should look up the specs but I expect 90 degrees celcius is pinuts to withstand.

The wires going inside the oil bath are silicone wires from electric racing, the shielding can withstand high temperatures. The shrinkwrap does not melt either. And because it is oil and low voltage powered there is no way to have a shortcut.