Replacing chain ring

Back in the day when derailleurs were crap and nobody had any money anyhow guys would tour the Yorkshire Dales on 48x18. I used 50x20 which is a little lower because I was a useless climber. With your 52 ring a 20t sprocket would give you a similar gear to 48x18. Might be worth considering if you are on fixed and can get a cheap sprocket
Single speed is always a compromise but unless you have a stiff climb every day 48x18 will be OK.
3/32" and 1/8th" are the nominal widths of chains. I couldn't get your link to work.
What is your back cog at present?

Oh sorry here it is again Evans Cycles | Token Track Chainring 1 1/8" | Online Bike Shop

My back cog is 16t, I was thinking of temporarily having it single speed so i'd need a single speed cog.