There are drop in models like mentioned that can run off your ballast or direct bypass, yes. Then the step up would be LED retro fit, which means a bit of fiddling but eventually yeah- you get a big heatsink with reflectors and all.
But you have the headache of things like, does the strip fit? Immediately behind my bulbs are a wedge shaped reflector- so I can’t just pop it in. I measured, turns out there’s enough space on either side of the wedge, so I can mount 2 strips, on either side, and hope that works. We’ll see, I have to order some still. You get better efficiency than the drop in replacements and better density, but you get to be your own engineer.