Right-sizing my spare

Recently did a leveling lift kit and got larger tires, now trying to get the correct spare setup without taking out a second mortgage. I'm running factory upgraded rims (Ultra Clash 20x9) which I think have a +55 offset which seems to be fairly rare. So I'm left with either A) spending a ton of money on a matching rim and tire, or B) buying the cheapest rim that fits my lug pattern with the cheapest tire that matches my diameter and then being worried the offset will cause problems if I ever have to deploy the spare.

Am I missing a third option? Suggestions? I don't do any off-roading so the idea of spending $800 or more on a "what-if" scenario isn't something I'm in love with.

 

Matching diameter on a stock spare rim should be fine for the short run I believe. Stock rims have a similar offset.