Gepards take them down just fine and apparently Rheinmetall is frankensteining Skyranger turrets onto Leopard 1 chassis -- MBT-wise the Leo1 isn't really combative any more but tons are available, also, Ukraine has already plenty of those chassis and knows how to service them. The Skyranger is a definitive upgrade over the Gepard's cannon and targeting, it can take down whole swarms. Also: New are actually getting built, noone's going to build a new production line for Gepards.