Always good to have a back up plan for a ppr when moving in with a partner imo. I wouldn't be rushing to sell my ppr unless it was necessary financially - it's so difficult to buy a house now due to high prices and huge demand, and with an increasing population, it may get worse. You can sell at any time, although tbf, it's probably easier when a property is vacant.
RaR rules means that lodgers must share with the owner and that ceases if you move out. Living part time in a ppr might allow the RaR to continue.
Or, you all move out, ask the lodgers and a third person to sign a new lease for the entire house at market rent, or let it on the open market to completely new individuals, and register with RTB. If you lease the entire house at the current RaR rate, that sets it as the rent cap for any future tenancy. Room by room lets have a different set-up, there is an earlier thread discussing it which may be useful.
You could short-let. If its a PPR, short-lets of up to 14 days that do not exceed 90 days each year, do not need pp, just notification to LA. PP is needed when the 90 days is exceeded or when the property is not a ppr.
Afaik, short-let / home-sharing of 14+ days in a ppr are just lettings to lodgers, ie. no annual cap and no pp.