There are quite a few motorsport type places that do electric oil pumps, I was going to fit one of these (or perhaps even a fuel pump) possibly with an inline thermostat and bypass loop. So are you saying that the e153 has a pump in there already, or was the pump left off too?
What car is your cooler off? I just found out after 4 years of ST205 ownership that my JDM gearbox oil cooler is about half the size of a UK spec one, the Uk one looks positively huge compared to it (I feel quite inadequate :lol: ). No chance of that with the new ones, the GB one is 10 row by 235mm, the engine one 13 row by 235mm, both MOCAL type things off eBay.
For the engine oil I have a sandwich plate with a thermostat built in.