You can create custom search engines and it is so easy that it only takes 3 clicks and less than 5 seconds.
Opera Help link: https://help.opera.com/en/latest/search/#defaultSearchEngine
Per Opera Help:
Right-click (Ctrl + click on Mac) on a site’s search bar and select Create Search Engine…. Assign the engine a name and keyword. Click OK.If you want to edit them by hand. Go to Settings >> Search engine (basic settings) >> Manage search engines and site search
Default Search Engines:
Amazon - z
Bing - b
DuckDuckGo - d
Google Search - g
Wikipedia - w
Yahoo! - y
Here are a couple that I created.
Custom Search Engines:
Brave Search - v
IMDb - m (movie)
IMDb Advanced Search (goes to page) - n
Yandex Search - x
Yandex Image Search - i (image)
Search Engine: Brave Search
Shortcut: v
URL query https://search.brave.com/search?q=%s&source=web
Search Engine: Free Dictionary.com
Shortcut: f
URL query https://www.thefreedictionary.com/_/search.aspx?tab=1&SearchBy=0&Word=%s&TFDBy=0
Search Engine: IMDb
Shortcut: m
URL query https://www.imdb.com/find/?q=%s
Search Engine: IMDb Advanced Search (goes to page)
Shortcut: n
URL query https://www.imdb.com/search?ref_=helpms_ih_dw_advanced_search
Search Engine: Yandex Search
Shortcut: x
URL query https://yandex.com/search/?text=%s
Search Engine: Yandex Image Search
Shortcut: i
URL query https://yandex.com/images/search?text=%s