Yea, understood.
There's also a simple combined soldering gun & sucker Yihua sell for £35 but I'm not sure that's going to work as well. I still haven't been able to find that knack for using a solder sucker and breaking those first two Dualshock 4 boards has made me evaluate options. I know I've got to spend something to upgrade my soldering iron and I suppose the budget heat guns and solder irons are cheap enough that you could run them in tandem with this unit as a desoldering gun only, but again might be getting even sillier for my usecase.
I found one channel on Youtube (Retro Computing Reboot) who did a review of the unit 6-months in, working on old 8-bit computers. Claimed to have used it for 3-4 hours a week, but cruicially mentions that it does the one job it's meant to do very well of removing the solder. Although technically his review is on the non-I version without the soldering gun.
I did notice there's a sale tomorrow, so will see if anything comes down in price and make a decision then. Again thank you for the guidance.
EDIT: Just found Yihua sell the 948 desoldering gun for £115 atm. This is the non-2-in-1 version. So I would just need a competent soldering iron to go with it.