How expensive are the mounts you're considering? It may be a better overall value to buy another 2.5x.
Good question.
Just ballparking it - detachable ring sets from Talley & Alaska Arms for Rugers will likely be $150 - $200. Another Gold Ring FXII 2.5x20mm delivered is likely a bit over $300.
Assuming, of course that Leupold doesn't quit making 'em ....