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Gaz,
It is very much possible, although not a perfect scenario. You have to run a very tight lash, where cold lash is almost at 0, or you get the behavior that you talked about. You are right about a solid cam's closing ramps, used to keep from slamming the lifter back down on the lobe.
I wouldn't say lots of guys do it, but it is done more than you think, and my cam grinder even offered it as a suggestion when I was losing control of the valvetrain on a hydraulic roller motor.
There is a tight window for operation: too much lash and you break things in a hurry.....too little lash and you may hang the valves open when the engine is cold.
However, you can run a solid lifter on a hydraulic cam, but not vice versa.
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