Consistency matters for citations, and this is definitely a case I haven't dealt with before. Since the name is so unique and many sites won't allow for special characters I would pick one format to use across local citations. I guess the big question is how sites see the special character. If they see "No1" as "NO-1" that might work against you from a branding/dupe listing standpoint. If the rest of the information is the same across the citation sources, then it's possible the name variations could get aggregated together. In that case No1 and N°1 could become synonymous and acknowledged as one and the same.

I see a lot of sites are respecting the special character, so the best advice is to try and make it as consistent as possible. If you have a minority not respecting the character I wouldn't worry too much about it. You're playing a numbers game, so the more sites (quality sites) that have the special character will help you. The ones without may count for slightly less, but might not hurt you too much.

Google's most likely removing this feature. See this great thread in the local search forum to learn more. To summarize our assumptions, it's because the only people that really used this feature were SEO's to check ranking. Normal searchers either modified the query or did nothing, since most people probably never knew that feature existed.

There aren't any rules how the description should be formatted in Google's Guidelines - https://support.google.com/business/answer/3038177?hl=en - however it's worth noting that the description you list in your dashboard may not show up for customers searching for your service/company. Google made the shift a little while back to show a limited amount of information (NAP, website, hours of operation, reviews) which doesn't normally include the description. I haven't seen anything to suggest adding more keywords in the description will boost ranking, especially since it's a hidden element for that page.

Local SEO Guide did a great study on Local SEO ranking factors - http://www.localseoguide.com/guides/2016-local-seo-ranking-factors/ 

Read through that to get an idea what to test & try to get your page ranking better.

What if you use a concatenation formula in excel? If you have a list of all the old pages, and all the new then you could put them in separate columns and run a formula to fill in the required areas to the code. Seems like if there's a specific code that just needs the copy and paste touch, that could work in a pinch.