My Largest Account Is Pledged for Staking Can I Vote Using It?

There is an 80 times difference in ADA, so I would obviously like to take advantage of that.
Is there any problem choosing the pledge wallet?

Nope, should be fine, pledge or delegate = same

Thank you, perfect!

This is for my own SPO that I’m funding, which is why I wanted to ask first.

Yep, definitely used the wrong wallets, particularly in Daedalus. I can’t even remember the UX flow to be honest.

I hope I will be able to simply merge my two[?] Catalyst accounts, and be grateful Tx fees are nearly nil will I fatten up the chosen Catalyst account/wallet.