We did it for a while, UK's not really a problem as HMRC are more than happy to keep you as a tax Resident, it's making sure that Portuguese Financas don't decide your a Tax Resident, the 183 days is easy enough to prove, it's the primary residence that becomes the issue, we where able to get round this because of UK ownership, rates, utilities and everything else in a sole name, to UK address, but a few years ago now.
As one was Resident and the other not, we also did not claim the IMT concession, as that is only for Residents