Hello from the United States, in the process of importing a 1992 Daihatsu Mira TR-XX

I forgot mentioning removing the front bumper. Mine is only held by about 7 screws and can be removed within minutes. It would make a world of difference, given that access to the front mount and exhaust bolts would be nearly impossible, if you didn’t get things out of the way to begin with.
What you might want to do, in order to assure near-complete oil drainage, would be to perform the following modifications found here:

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