My thought was also, just get a real estate license and get into commercial brokerage if you're interested in commercial.
Very few buyers have the ability nor desire even if they have the ability to purchase in cash. You would be essentially have a clientele of ultra high net worth, family offices, and institutional buyers. So on the buyer side, you are dealing with sophisticated people.
As mentioned by others, on the seller side, you're dealing with sophisticated people. They aren't going let you tie up property so that you can show it to national tenants, nor are they going to let you have it for a discount of 20-50%
The properties that attract credit worth national tenants are not the type that will require a wholesaler. The dilapidated and distressed properties may hear offers from a wholesaler, but those are the class C and D properties that do not attract cash buyers and investors.
I could go on. It's great to think about this and think about possibilities. But essentially everything you just listed you can do as a commercial real estate broker, and do so more "legitimately".