you can definitely use the same blot after ECL. I do this all of the time.  With my westerns, I run my protein of interest using traditional ECL.  After I have taken my pictures I run the loading control in licor blocking buffer and look at the fluorescence.  This process enables me to have 2 antibodies without having to cut the blot or strip.  It works best if the two antibodies are from different species if the two proteins that you are looking at are close in molecular weight.  I often look at a protein 44-45 kDa for ECL that is ant-rabbit and then look at a protein that is 42 kDa for fluorescence that is anti mouse.  You can do also look at two proteins from the same species if they are a further apart in molecular weight.  This only works if you are using nitrocelluose membranes because traditional PVDF membranes autoflouresce too much on the Licor machine.  

Here is my protocol.

After taking pictures in ECL, I do the following

1. I rinse the blot 3 x 5 min in PBS.  

2. Then I probe my blot for gapdh or beta actin in licor blocking buffer for 2 hrs at 4 degrees.

3. 3 x 10 min washes in TBST

4. Then I probe my blot with secondary (680 or 800 channel) for 1 hr at room temperature.

5. wash 3 x 10 minutes in TBST

6. Scan on Licor

I already have done it without any problem. Wash first with TBS-T then with TBS and probe it. However, if you need to use a IRdye secondary antibody against the same primary that you already used before with a secondary HRP, you need first to remove the secondary by stripping. In this case i would recomend to strip and probe again with primary and then the IRdye secondary antibody. You can test first if the secondary has been removed using ECL.

Yes and no.

If you used membrane for fluorescence, if you use and antibody at a different molecular weight, why not. But, I would start with the fluorescence as it provides less signal. However, it depends of how abundant are your both proteins.

The question concerning the stripping is unclear, why do you want to strip the membrane? Does the second antibody you want to detect raised in the same specie that the second antibody you want to detect?

If you want to avoid stripping of secondary and primary abs you could try to use fluorescent labelled "anti-scondary" abs,  after removing ECL.