I would suggest sticking with some lower-end Kendas rated for 70-PSI, only as I have seen the higher-pressure hooked-bead tires to give somewhat lesser performance when 20 PSI under max.
By the way, if I'm not mistaken, the Cyclepro skinwalls also come in 1-1/4. I recall using a pair on a Raleigh Marathon mixte I sold on C-list. Great tires for the price, I must say! Best for hooked-bead rims though.
You might want to experiment with some Continental 1000s, for I recall using one on a Sturmey-Archer straight-side steel rim once with no ill effects, even at the lower PSI.
And when all else fails - put some hooked-bead 27" rims on that sucker!
-Kurt