I personally would just use a floatation sling attached to 2m or so of strong rope.
I have the prologic floatation sling and I have used it to sack a 27lb common for my dad for a few hours and it was fine.
I will continue doing this until I find a more worthwhile choice.

I haven't used them before but blakes baits seem very cheap.
they have lots of boilies , pellets and a lot more.
I would say if you're stalking, I would buy the most complicated and expensive bait out there - value sweetcorn.
The cheaper the better.
1kilo bag will last a while and can cost £1 or so