IMHO, you need a few fixed Tarmac Rallies, i.e: Monte-Carlo (yeah OK I know it's with snow/ice but you get the idea), Corsica, Spain, Germany & now Japan. As for the other events, as suggested, rotate Rally GB around UK & Ireland so when it comes to Ireland, it will be a tarmac rally. Also you can put each year a different Tarmac rally- once (just throwing it in as an example) Bulgaria, another time- San-Remo, the next year Ypres rally, after that Barum Czech rally Zlin, and so on.