90 760T 213,000

Found out where my coolant system is leaking - the heater hose that runs into the block underneath the intake manifold.

Questions:

1)If I keep close watch on the temp gauge, will it be safe to drive for a few days till I can get the hose from the local dealer?

2) Is it relatively easy to replace the hose without removing the intake manifold. (Looks VERY tight)

3)Should I go ahead and replace the heater valve and the other hose (leading to firewall)?

NOTE:
I replaced the old plastic radiator with an IPD metal one at ~150,000 miles along with upper and lower radiator hoses.

Many thanks for any advice!