OK, have read enough to realize knowledge of this issue needs to be more widespread, and also apparently the DX5e has two power switches in parallel for different circuits, one goes to the actual radio stuff and the other to the LEDs/beeper and who knows what else, that's why the TX function can cease with the LEDs on.
I think the easiest fix is to remove the rear panel, bridge the switch connections with wire to 'on', and add a good switch to the battery feed from the battery tray. Will need to put the switch where it can't get jostled, of course.
I don't see a compelling reason to replace the parallel-switch action of the original switch as it does not seem there is a timing issue where one circuit needs to go hot/go dead before the other.
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