Is it feasible to receive dividends from US companies in USD without the need for it to be converted to euros?
legally → depends on the account type
in SIPP (if it ever gets introduced) and invest account you can hold foreign currency and there is no need to do a forced FX conversion. This is the industry standard in established brokers.
in ISA you cannot legally hold foreign currency and foreign exchange has to be executed at or before stock settlement (usually 48 hours after the trade execution)