To oversimplify, Volts x Amps = Watts
Then, whatever doesn't get out to the antenna is "dissipation".
Volts x Amps x ?% (50% for a first go) = Watts
Then, Volts x Amps x ?% (50% for a first go) x 4 = PEP
...because PEP is simply four times your carrier when 100% modulated.
So you can increase the voltage , current, or efficiency, or all three.
As an example NXP's bleeding edge is now 65V @70+% efficiency.
https://www.nxp.com/docs/en/data-sheet/MRFX1K80H.pdf
(note: see pg 9)
...but you just want to smoke the traces out of a stock radio and melt the main power switch.
In all but a few even SSB radios all the power goes through the off/on switch and the mode selector.Then there is the HR2510 and those "like" it. Just put power to the driver and final all the time and only turn the "radio" off and on .
It's never simple , it's never easy, it's always just numbers.