The only method I can think of is to download a ROM and test it with an emulator, and then delete it 72 hours after I download it. However, I'm uncertain if this is legal.
How can I test a Wii game before buying it?
How to legally try Wii games before buying them
nintendo-wii
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Best Answer
Disclaimer: I am not a lawyer. Copyright laws differ per jurisdiction. What I've stated below is the norm in most countries.
Downloading a ROM is illegal. No matter whether you own it, or whether you only keep it for a few hours, it is always piracy.
See the Nintendo FAQ on the matter for more information.
In case you don't trust Nintendo because they are partial to the subject, the WIPO Copyright Treaty explicitly prohibits circumvention of technological measures and unauthorised modification of rights management information in articles 11 and 12.
As for your second question, there are a few options you could try. Like Martin suggested, you could try going into a game shop and see if they have a console you can try it on.
There are also options to rent a game instead of buying it, and you can always buy it again afterwards.
Alternatively, if you are committed to circumventing copy protection in order to play illegal copies of video games, might I suggest moving to Monaco. On balance, it is a far more desirable place to end up than say, Nigeria.