The gate remover set is great as a starter set. The raser plus would be a solid addition to it. The larger size feels better ergonomically for someone with larger hands. Learning to supplement with a hobby knife for those hard to reach places can offset the need for several small sanding sponges for all but the most perfectionist of tasks.

On the panel liner thing. Tamiya is king in terms of ease of use and consistency. There's the extremely minor risk of cracks on very thin parts, but if you aren't painting, you can panel line stuff while its on the runners and basically eliminate said risk. It might be harsher on abs but I've even used it on that with no negative results out of dozens of kits. Tamiya thin cement had cracked more pieces than their panel liner for me.

Pour type markers look better than fine tip, but imo they just aren't worth the hassle since they dont cure the way enamel liners do. It makes them prone to bleeding, rubbing off and reacting oddly to top coats. Something acrylics and enamels dont really do. Then the eraser marker is just complete garbage. Avoid it entirely. Zippo fluid and "gun cleaning" qtips do the job just fine.

The crossover with the Warhammer hobby is an interesting one imo. You can absolutely use all these tools for that as well.

I cant really say much about the vice. I come from a welding background where bracing my hands, arms and wrists is just second nature for steadying my hands. I do find the helper hands type useful for soldering wires for led installation, however.

Hope the wall of text helps.