Let's suppose I wish to fly an IFR flight from KTUS (Tucson International Airport) to Fort Stockton for example. Given the surrounding terrain there is of course an ODP which reads the following :

DEPARTURE PROCEDURE: Rwys 3, 29L/R, climbing right turn direct to TUS VORTAC...
Rwy 21, climbing left turn direct to TUS VORTAC ... 
Rwy 11L/R, climb heading 123° to 4000 then climbing left turn direct TUS VORTAC ...    
... Climb in TUS VORTAC holding pattern (hold NW, right turns, 128° inbound) to 9000 before proceeding on course.

That's a pretty long departure procedure especially with the temperatures this time of year but it makes perfect sense due to the terrain.

Now since I expect the weather to be CAVOK until the MSA, I would prefer to do a VFR climb-out. In this case, would I present myself as a regular VFR traffic to clearance, ground and tower frequencies and request IFR once at MSA to Center ? Or would I request an IFR clearance on ground and adding the request for VFR climb-out up to the MSA ?