I have a pair of skews: I only ever need them very occasionally for that last tiny bit in the corner.
They're re-ground 1/4" chisels from Bristol Designs's odd chisels bin - bought totally blunt for their length and reasonably good handles. I think both together cost me about 15 quid.
The grind was easy on my Tormekkalike, and I hone using an inexpensive, aluminium, own-brand Axminster roller guide that's intended for plane irons. It has a wide, slightly cambered brass roller, and a flat plate on top, with a rubber-faced hold-down clamp. The chisel goes diagonally across it, following a pencil line put on with a mitre gauge (and a protractor). That serves well.
(a link to a 'Get Woodworking' tiny review)
Axminster don't seem to sell that guide any more, which is a shame as they are handy for all sorts of awkward things, but they're on eBay and Amazon under the "Narex" brand. The cheapest I saw them today was about 20 quid (Amazon), but an image search might yield a bargain, as I'm sure they are Chinese, made in quantity and sold under many names.
I didn't want 45 degrees, as the pointy corner becomes too fragile, so they're a bit less than 60.
It works. They hold a good edge. I don't fuss but just use them as needed.
E.
PS: I use the same guide to do the irons for my little side rebate plane - those are much more tricky, as they aren't what they seem - skewed in two axes, and they're really short.