Well, since SearXNG aggregates results from more than 70 search engines and not solely Google, it’s a safe bet they’ll be fine regardless of Googles moves. However, sourcing results from Google may be impacted, but they still have many other options built in aside from Google. Whoogle being a proxy only for Google makes it reliant on Google, so their upstream changes will be very noticeable. This being the case, I’d say switching to SearXNG is going to be the best move as it has redundancy built in making it not dependent on any one engine.
I’ve been really liking the KISS Launcher, it’s power is in it’s simplicity. It also looks relatively comparable with Smart Launcher. What’s super impressive about the KISS Launcher is that 93% of users that try it for a week are still active users after 3 years! So definitely worth a gander for sure.