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Yep just spring it apart and put any 130mm hubbed wheel in. Wheel/cassette alignment shouldn’t change much, but if it does you can normally recentre the hub/wheel with the screws on older style slotted dropouts provided the frame has them (most older frames do).
Plenty of older frames will take 130mm. Alternatively cold set (permanently bend) the dropouts apart out so they stay at 130mm then get lbs to adjust hanger so derailleur sits straight (again should hardly change but more of an issue with more speeds).
Ah right. There are older (early / mid 90's?) steel frames that were made for 130mm hubs as well though, right? Maybe for 8 and 9 speed then.