Lead isn't even allowed in my neck of the woods. That said, it doesn't cause the stated problems: If you are shooting at distances and objects where ricochet is an issue, that's either pretty poor course setting or a performance issue.
At well over a pound twenty per cartridge for Bismuth, the argument for keeping the family heirloom gun as your go-to gun without shooting lead doesn't make sense economically for moderately enthusiastic clay shooters. Compared to prices for steel cartridges you're effectively burning up a pound every time you pull the trigger, so I'd keep the damascus barreled SxS or gold inlayed B25 on the mantle in favour of something more sensible for shooting steel. One could justify the purchase of a very fine steel-proof gun compared to the savings over the course of a single year...
Whether or not a gun is "steelproof" is a whole different can of worms entirely, here perhaps more so as we don't have a proof-house. Steel does require more open chokes and with market-demand for interchangeable chokes, the 1/2 - 3/4, and 3/4 - full guns tend to stay on the shelves here anyway at any given price.