[3np]

Host a personal (potentially shared with friends) searx (for multi-engine) or whoogle (google only) instance. Filter out some domains completely, rewrite others. The rewrite part is what allows you to substitute spam clone sites for the real deal. At least searx does dedupe already.

The time spent (including maintenance) will be paid back faster than you might expect.

Optionally rewrite some sites to altfronts like nitter/scribe/piped. If you care about spending time on privacy and decoupling searches from visits, you can set up arbitrary proxying rules.

One benefit among others over browser extensions is that it's a one-time setup for all your devices and clients. All you need to do on reinstall is to change the default search engine.