Advisable indeed. You never know what fees will get to but you might wind up with an outrageous bill further down the line that's relative peanuts now and you have a lot of stuff to gather up. I've done it in the past and I do it periodically if coins need consolidating.
I haven't used my Ledger in absolutely ages but I'm pretty sure there's a custom fee you can set so no need to use Electrum. I could be totally wrong.
Dunno about 1-2 satoshis but I did an 8 sat/byte transaction yesterday and it took about 7-8 hours to be fully confirmed.