I think teeing into the two lines near the fuel filter should provide enough room. The regulator itself can be nearby were it fits and is protected from the elements more or less. It does not need to be located at the fuel filter. A small inline plastic mesh type filter screen for the fuel flowing to the second regulator would be a good thing, but if there is no room, then it can be left out without major consequence.
The main consequence of warm fuel in the tank, is increased fuel evaporation rate. If the EVAP Purge fuel vapor recovery equipment is working right, then the recovered and stored fuel vapors will be burned up in the engine, and won't be wasted escaping to the outside air.
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