Hi,
I won't be able to comment on Lavieille to Radiant in a day, for the reason I've never done it..never tried. I'm a double carry so I would never come close.   Whenever I'm through that area I'm usually fishing as well so emphasis on taking my time.

Instead I'll answer part two of your question, decent places to stay.
I've stayed on Francis,  "The forks" and Lavaque.  I'm always travelling solo so I don't need much.  There is a site at the end of the 2460 going downstream on the Crow which would be just fine for myself as well.  Just haven't stayed there yet.

Not sure how that fits in your trip planning for spending the night, but I hope it helps. 
 

Longbow Lake at the portage to Bog Pond?

For clarity, the closest guess so far is Big Crow.  The lake in the pic is a days paddle from there.
 

Not Welcome Lake,
Wrong side of hwy 60.
Moving away from it now, by alot.
 

No, it’s not Big Crow, but it’s the closest so far.

No, it's not Opeongo.
 

Big Crow?

Hi Folks,
I got a phone call from Ontario Parks today for a trip I planned at the end of September.  I had originally booked the Highview Cabin for two nights but was advised its closed for the season pending roof repairs.
It didn't impact my trip much I just made some minor adjustments.
Thought I'd let everyone know..
CC2K