I can't find the page on the Marlin site, but a few years ago they made a "special edition" 1894 that actually had a pistol grip stock and lever to match. They didn't make many, and they stopped in order to make more other stuff...
You have identified the biggest issue for me for the 1894 - I don't like that straight stock.
I wonder if the 336 lever fits the 1894? The stock doesn't. But at least that would be a source for the lever...