Tankluver:
I am kind of hoping to make this an actual what if scenario, where it would be the actual invasion. I do like the idea of the training landing though, it sounds very comic in some ways.
Well, the considered professional amphibious warfare opinion is that, had SeeAdler been pushed forward, the Germans would have been lucky for it to only reach Dieppe as a debacle.
There is very little evidence of any sort of combined-arms planning, where Falschrimjaeger would have been used to secure port facilities for unloading heavy equipment. The bulk of what was assembled was little better than longboats; good for infantry, for horses, but useless for anything resembling the Panzerdivizion as used in 1940. The Germans also were bogged down by their own logistics tail. A full 2/3 of their boats had to be dedicated the 3 B's--bullets, beans, & bog paper. Just as the Germans had not developed ramped landing craft, they had also not developed a dedicated supply train. They had no ships similar to the APA's and AKA's.
Which meant, instead of cycling waves of landing craft a mile or so back to the landing ships, they would need to be taken the full distance back across the Channel for everything.
So, the "what if" is thin gruel at best. The initial landings would been chaotic, a number of the barged would have been sunk or riddled with fires from Matilda and early-Mark Churchill tanks. The latter easily capable against the tiny numbers of specialty armor that could have been fielded. The littoral is an unkind place, and it has little charity for those who would war across it without due respect.
Which is why I'd find an exercise, one of the practice sessions, a much better thing to model. Not needing to "what if" or "speculate" removes much deus ex machinata in the posing. The people involved need not be in dire straights, but can be a fervent and devoted as is humanly possible. But, mostly, an exercise is one of the few times the various specialty bits/vehicles are likely to be in the same place at the same time.
But, that's my bias. I've landed and recovered an entire regiment across a littoral a time or two. And, for all my time sorting Logistics on a Beach, I still do not have the first clue how to properly model the way the sand and ocean meet that gives that feel or wet, super-saturated sand; then the damp sand, and then the transition to the powdery, dry sand from above that to the scrub line. Sigh.
It's said--incorrectly--that "Eskimo" have 12-14 words for "snow"--well, I've tried, but I run out of cuss-words about 9-10 when naming the kind of sand out on the littoral . . .