Nhl3.5 lime mortar , hot lime , external render

Hi all , I’m doing up an 1910  farm house at the moment, which had previously had its external render completely remove & then the southern facing wall was pointed in PUre CEMENT which had major damp issues ,  I now have removed all concrete pointing ! My question is this , there is a lot of discussion at the moment regarding NHL3.5  and there suitability’s for pointing as it will keep strengthening! (In 10years it might be like cement) 

Should I use hotlime instead ? 

I know the house will have to be completely lime plaster but the time of the year is against me ! 

The wall is bare inside & out and is very wet 🙈thanks in advance , total confused lime converter