@element You probably need to get help from an existing Matrix user who's involved in Horizon funding, otherwise this is impossibly hard. What about German healthcare?
The website https://gaia-x.eu/ got confusing, might still be worth joining.
Any project needs padding to cover the academic partners' fixed costs. Only GÉANT gets significant money for infrastructure https://cordis.europa.eu/project/id/101194278; in https://cordis.europa.eu/project/id/101147319 , https://cordis.europa.eu/project/id/101129751 the main suppliers get 2-10% of the pie.