A police Force is the answer

Daniel, the optimum solution is for Guaidó to request assistance to create a 100% Venezuelan police force, with a core made up of military personnel who fled and will flee. I believe it can start with about 5000 but has to grow to at least 20000. 

A sound intervention strategy has to aim to preserve the armed forces structure and as much personnel as possible, therefore what is needed is a group of well armed police (using the term police is important even though they can be armed with full military gear). The regime is relying on convicts, colectivos, and small contingents of PNB and GNB to do the heavy lifting. Therefore a ground force focused on taking control of a small part of national territory, BACKED with air, naval, and logistical support provided by other nations, can have success. Rule of thumb tells us that 5000 "police", backed by an air carrier air wing can control an area with 100,000 inhabitants quite easily. Thus the initial target has to be a small city, or a rural area with small towns.

Let's observe what was regime response to events on the 23rd: in Ureña they used small GNB contingents which numbered about 50 at each bridge, and the presence of Iris Varela tells me the "security forces" must have been, or included, convicts. The response to the Pemon rebellion in Santa Elena de Uairen was a convoy of school buses loaded with colectivos, milicianos, and some PNB and GNB which proceeded to shoot up the town. 

Therefore I deduce the regime lacks a rapid response force, it's made up of lightly armed irregulars, and can't use the Armed Forces AS LONG AS THE ENTRY IS BY ARMED VENEZUELANS BRINGING FOOD, MEDICINE, AND SECURITY. 

Using the same rule of thumb I explained, with a 20000 strong force it's possible to control an area with 1 million inhabitants. The premise is that close air support will be available. And that logistics are set up to provide food medicine water, gas bottles and power. 

Once this expeditionary force has one million within its control, it should start receiving a flux of volunteers to allow creation of a militia. Whole military units may shift allegiance, and thus the main issue will be figuring out how to sort out spies and saboteurs. I have used a boilerplate ratio precisely because I'm afraid the regime will be infiltrating their guys. 

So what's the Cuban reaction going to be? They can't send bus convoys loaded with colectivos because they would be cut off by air power, they are unlikely to send army units, the navy and Air Force will be useless, and they will see that, once a significant force has punched through that cellophane they use to keep 30 million Venezuelans hostage, all they can do is caused a bunch of dead and risk the capture of Cubans who will reveal their role in Venezuela. 

I'm describing this to you openly because I think that once they know this is coming down the road, they'll start figuring out how to fold and get out while the getting is good.