I've driven multiple times in the UK without an IDP (Only avis needs an idp for rental for non eu driving licenses).

I have taken that same car and driven it into france and ireland, all without an idp.

i have also driven in norway, sweden and denmark without an idp, with a car that was rented in the oslo airport.

likewise, my norweigian, greek , australian and british friends and family have rented cars and driven here without  an idp or permit of any kind.

the only issue we had was my brother with an australian license tried to drive into thailand, and was told that only malaysian drivers are allowed to drive there.

his malaysian license was expired, so he had to switch drivers with my dad.
as long as its a holiday it should be fine, long term you will need to get their actual license

don't care what it's called, u can get that for RM100
but i believe a majority of malaysians can't even survive 5 mins driving overseas even with all the permits they bought

no one's gonna understand what's written on your license when you show them. means no license. capeesh? idp is a certified translation of our driving license in those country that recognize it.

Rather than worry about IDP better if u study different toll system and driving rules of each country if u plan to drive cross border.