Re: Questions on Scraper planes...
Barry, this should be a topic posted on the Hand Tool forum. You’d get more responses.
I have owned a few scraper planes, the most well known being the Stanley #112. I sold it some years ago. I found it very limiting, which is explained below. I still have a Stanley #80, which gets pulled out when glue needs to be removed.
As you no doubt are aware, I use hand planes a great deal, both for shaping and also finishing surfaces. Almost all the time a scraper is rarely used as I can achieve a far better finish with a hand plane, and also avoid tearout in the process. The key is using a closed up chipbreaker or a high cutting angle.
When I do use scrapers, I prefer a cabinet scraper (card scraper to you) as it can be finessed and using in small areas. I try not to bend the blade much, which also reduces the pressure on my thumbs. It is possible to get a pretty decent surface with hard woods …

Scrapers come into their own with curved surfaces, such as this bow fronted drawer front …

The scraper used here was made from the rear of a 3/16” thick O1 plane blade, similar the the scrapers sold by Stewmac. This is a very easy-to-sharpen and useful tool.
Regards from Perth
Derek