The developers have yet to say what happens to the govex if their faction makes peace with the occupier. Also they did not say whether a govex an be formed through events. Since there was no war between GER and CZE, and there will be no war between GER and the Allies following the occpuation, I have my doubts as to whether the game would allow the formation of a Czech govex. Because here is the thing: If GER controls CZE provinces, then CZE and GER probably need to be at war. (Otherwise units under control by the CZE govex could land in Poland, march through Slovakia and enter GER-occupied lands, restoring control without a fight.) Or they need to have been at war briefly so that GER could seize control of CZE territory. But if CZE is in the allies, and GER and CZE are at war, then GER and the Allies are all at war. This is not what happened historically.- then 15th March 1939 comes and German units come with it to occupy the rest of the Bohemia and Moravia, Slovakia claims independence and becomes to be a German puppet afterwards, the rest of the CZE regular government (i.e. player or AI) is now given and option to capitulate or to continue as ExGov in London, this will enhance the gameplay of both GER and CZE because CZE will be able to perform actions as the other ExGovs (e.g. support partisans etc.) and GER will be able to choose its policy towards the remaining part of Czechoslovakia (so called "Protektorat Böhmen und Mähren") and install a collaborative government in there, for example (which will also have effects on resource gains, partisanship level etc. on that territory)
- when the war starts, the CZE ExGov can organize its own foreign military units, first in Poland (where in real some of them fought alongside the Poles and then escaped through Romania)
In WW1 there was also an "exile government of Czechoslovakia" but that was just a group of Czech and Slovak exiles getting together and claiming to be the government of a country that did not exist, a country whose people were still all citizens of Austria-Hungary. That was just as illegitimate as the pro-Soviet "Committe for a Free Democratic Germany" that was set up in Moscow in 1942. So not all bodies calling themselves "government in exile" will be in the game.