I wouldn't bet on the transfer installments mate. Didn't we sell on the Coutinho fee to an investment bank so we could get the funds up front and have the cash to splurge? We may have done the same with the players you mentioned
I've been looking at the Coutinho thing. Firstly, our accounts at 31 May 2019 show lots of debt due after more than one year, which would have to include Coutinho, so we hadn't sold it at 31 May. Barca's accounts for 30 June 2019 state that we had sold it, but the amount due is apparently €28m in the next twelve months and another €67m after more than 12 months (presumably paid over more than 2 years if paid at a consistent rate of €28m per year, meaning it would be 3.5 years before we got paid in full). No way we sign up to that when we sold him, we had the upper hand in that deal, hence the fee. The Suarez deal was paid in 5 instalments, so fully paid within 2 years and 1 day.
So what I think has happened is that Barca were struggling to pay the fee as scheduled, they approached a bank who agreed to buy the receivable off LFC and allow Barca more time to pay in exchange for fees and interest etc).
So yeah, maybe we sold that receivable between 31 May and 30 June, but I don't believe for one minute that we did so because we needed the cash. Rather, I think Barca needed more time to pay and if we agreed to help them out by assigning the debt we got our money earlier than planned, so why would we say no?
It wouldn't make sense to sell transfer receivables from UK Premier League clubs because we could recover the money directly from the Premier League if it was paid late (e.g. if Southampton defaulted on Ings, the Premier League would pay us directly out of their TV money). The others would be small change, relatively speaking.
Most of the UK clubs who are strapped for cash borrow against their future TV revenues as they can borrow more meaningful amounts at lower rates. I don't see any evidence that we've done this.
I have never seen a major transfer done other than by instalments. I've seen some where the first instalment has been a bit bigger than 1/3 (maybe as much as 40%) but nothing more significant than that.
The only exception I can think of would be something like the Werner deal where, allegedly, it was all due within 12 months, but that was because it was activating a release clause.