Mullvad has a 30-day money back guarantee.
Apart from that, some payment methods (like crypto) allow transmitting arbitrary amounts. At least, paying for years in advance works without issue. You could pay a few cents and try it out, but be mindful of fees.
Almost all extensions will weaken your security posture. In fact off the top of my head there are basically only two kinds of extensions that could improve it:
Anything else is questionable at best. Maybe you could create browser profiles where you install extensions somewhat more liberally, with decreased expectation of safety.
Nintendo has moved over 140 million Switch consoles. The Switch 2 might become more, or less successful, but let’s just conservatively assume they’ll only sell half as many this time around.
Last time I checked, the entire Deck-like category amounted to some seven-digit number of sold devices. The idea that anyone targeting that level of performance is going to skip the Switch 2… is wildly unrealistic.