I've put a 130 wheel on a 126 frame without problem and without permanent spreading. And before anybody tells me it'll do some kind of damage I did it over 10 years ago now and it is still fine.

If you put a new 130 wheel with a 10sp freehub on, you have opened up all kinds of possibilities. I have 10sp Shimano cassette with a 10sp chain with Campy NR friction shifters and it works beautifully, or at least it did since I haven't seen the bike in a few years as my son has it out in Seattle. But shifting is very smooth with a light touch on the shifter, it is quiet, it is never between gears because the spacing is so small. The one thing I couldn't do though is put a wider range of gears because of the derailleur limitation, or at least not in the low range. The 11 tooth is smaller than the old 13 was.

But the key here is I didn't change anything else. It was chain, wheel, cassette. All easily done. Get a bargain or used wheel too, don't spend big bucks. I bought my pair here on BF many years ago by an infamous poster name R600DuraAce. He was always boasting about his power, and other such stuff and sounded ridiculous online, but in real like he was a really nice guy. And he was quite literally "yankin' your chain" with his posts.