You may wanna reread that thread - post#33 gives screen angles used, NONE of which sound as steep as your version looks to be - Also, the last 35 years before I retired I worked instrumentation in rare metals plants - we had well over 100 various vibrators, many of which were driven by compressed air. Our main compressed air facility put out around 4000 cfm @ 150 psi, and did it with 10 100 horsepower screw compressors - probably 1/3 of that 1000 horsepower went to running vibrators.
Even the home-grown units people on the linked thread built were run with around 6 horse gas engines - if a horsepower is spec'd in watts, it's 746 watts per horsepower so the trend was around 4,500 WATTS driving the screens -
Bottom line, my take (after 35 years in heavy industry) is that you will likely waste your money on a vibrator that small - also, even if it works it's a self-contained unit; anything that intentionally shakes something is basically designed to SELF-DESTRUCT - so when that type unit dies, you need to replace the entire thing. When the shaking is done with SEPARATE devices, the shaker part dying would mean getting maybe a new pair of pillow block bearings and welding some imbalance on another piece of plate (total cost maybe $35)
Disclaimer - no, I've never actually BUILT a shaker table (not that I couldn't USE one, already too many projects on my "bucket" list), so yours may work OK depending on what kind of material you have.
Plus, I'm used to machinery that needs to run 24/7/365, so I tend to over-build everything I do
Probably the BEST advice I can give is to reread that whole thread, the OP stopped posting about half way but there are others that chimed in with their experiences - it's hard to beat "BTDT" accounts... Steve