Hi there and
to the forums!
I'm glad you're trying to think of the best ways to keep Nikki happy.
Budgies are flock animals and so shouldn't be kept where they aren't part of a group. Whether that's a human "flock" that includes them in activities and bonds with them or is another bird depends on the bird; some are "people birds" and are perfectly happy as a single bird (provided their human families spend lots of time with them) and others are happiest in the company of their own species. Either way, if you think Nikki is not happy as a single budgie and you decide to get him a friend, it's important to consider several things.
The first is that quarantine will be necessary, so be prepared to house his friend in a separate cage in a separate room of the house for at least 40 days to prevent the spread of possible illness from the new bird to Nikki.
It's important to make sure you have the resources to provide vet care to both birds as well as house them separately on a permanent basis if they don't get along.
As for clipping wings, I personally agree that its like cutting off a person's legs and don't agree with it unless it's for the individual bird's safety (i.e a small safety clip as a bird learns to fly, etc.). Considering the analogy, it wouldn't make sense if a disabled bird were only friends with other disabled birds.
Wing clipping is a very contentious subject so I will post the necessary link here for you to make that choice. I ask other members to please refrain from posting your opinions on wing clipping as in the end it is the original poster who will be making that personal choice.
I think that Nikki would be fine with a friend who is fully flighted, if that's a choice you decide to take. Having extensive perches, swings, ladders and playgrounds for Nikki both in and out of the cage that are easily accessible by both budgies will ensure that both of them can play together even if Nikki can't fly.
I hope this helps
It's great to have you here and we look forward to meeting Nikki and any other budgies when you get a chance
Be sure to read through the forum's many "stickies" (threads "stuck" to the top of each subforum for easy reference) and articles to ensure you're up to date on the very best of budgie care. If you have any questions afterwards, please be sure to ask as we'd love to help!