For sure it's gotta look nice I imagine it's just a giant pain in the ass in terms of making it look good. The only example I can think of someone getting it to quote "work" is the beta Adrenaline model (which was just some yellow re-textured pain pills from the early versions of l4d2) maybe you could look to that for an idea/insperation?

Unfortunately there's no fitting Serious Sam 4 replacements for the Molotov, I did think of turning the grenades into Molotovs but the models look like missiles, which wouldn't make much sense in L4D, throwing a missile and it exploding in flames as it touches the ground.

As for L4D1-style Adrenaline animations that IS a plan I've considered and tried making a couple times. It's something I definitely want to try and get done eventually but obviously I'd like it to look as nice as possible.

plan on doing a Molotov replacement in the future

As a side note on most of the normal items. You seem to be the only author I know (least at this moment) who's done a L4D1 style re-animation for the Adrenaline Shot (Even if it's a model change and still different animations like it being replaced with the Rage Serum from SS4) I realize now no one's really put the Adrenaline Shot on something like the default Pain Pills animations. I only complain about it since I feel both the viewmodel and the animations for the Adrenaline are ugly as shit. Have you considered doing something like this or maybe take it as a suggestion?

You unlocked an ancient memory with the word "Push-pop", I need one now

The Forbidden Push-pop

Blue Crystal, is it edible?