I would recommend using the Transferwise route for charging the Revolut card for free as it avoids the unnecessary (and probably subobtimal) currency conversion required for SEPA. Transferwise has a Swiss IBAN so you can top it up using CHF and then charge your Revolut card from there. It does sound a little ghetto but it actually works and it is not that much trouble. Maybe some day Revolut will get the long promised Swiss IBAN, then this thing will be solved for good.
https://thepoorswiss.com/revolut-credit-card-no-more-foreign-exchange-fees/