esterigon has the ability to fit proteus electronics exactly as you said (by changing button tubes) and changing at the same time the small moving pin of the connector. And there is no reason to change the locking function too, so that way you will have a mech and an electronic lock. You double the security like this. Of course if you want to make it 5mm smaller, you can buy a new venting cap like proteus has
Am I right in thinking that some time in the near future Esterigon will be able to house Proteus electronics simply by changing the switch housing, allowing it to be used right up to 30 watts?