Good idea.  Minor point, just to make it a little easier –
That valve is inline in one of those hoses, the return I think.  I don’t know why you’d need to disconnect the other hose.  ??

From: Jim. Felder
Sent: Wednesday, June 30, 2021 5:32 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Hot Foot well

I went inside the cabin, dropped the glove box, clamped off the two hoses
going down to the heater valve,removed the hoses and dropped the valve
assembly with hoses and cable onto the driveway to work on it. You have to
undo the little clamp on the heater valve control cable by removing the
instrument cluster and the slider plate if I recall correctly.