Transistor latching circuit
No, you can just use the same basic circuit but swap the buttons around and add a couple of extra resistors.

This has the arguably slight advantage that the button turns the transistor it's attached to on instead of off, making it a little easier to understand.

But historically, circuits would tend to use active low inputs and connect the switches to ground, especially when using TTL devices which work that way.

Or, as you say, use PNP transistors and flip the circuit vertically.







simulate this circuit &ndash; Schematic created using CircuitLab