If you are in a position to buy, you could use Freestyle Libre. It's not CGM in that you do have to scan when you want to see your Glucose status. I very much doubt you would have one of these prescribed as you'd likely not fit any of the criteria.
The Libre measures the glucose level in interstitial fluid which is not quite so accurate as blood glucose level. However, you will get a reading when you scan and you will see this reading plotted on a graph, with arrow showing if rising, level, or dropping. This is very useful and something you learn to interpret. There are other 'numbers' you can get from the Libre system, such as 'Average', trends during the day etc
These cost just under £50 each, and last 14 days, after which they are replaced. Yes, they do have a small, very fine tube that goes just under your skin but the application mechanism does all that for you and you wouldn't see or feel it being inserted. It says in place, without disturbing, for the 14 days.