Musiclily Pro Electric Guitar Auto-Split Pre-wired Wiring Harness Kit Upgrade for American Style Strat HSS with 5-Way Switch and 3A Pots, Nickel Jack

You can get prewired harnesses to screw into any pickguard: https://a.co/d/0fwLMIXc Or just pay your local guitar store to install whatever pickups you want. You still get away for way less than that. You can get a nice set of GFS pickups for under 100, then maybe another hundred to install?