AW in Philly is working on an STC to replace the Kratos displays with 2 large format Astronautics units.Anticipated cost is AROUND US$120k for the complete kit.
This may be somewhat of a solution, but still perhaps $140 - 150K installed if the pricing estimate of $120K is reliable. However, not certain if the reliability and repair costs for these displays will be better. Should be better being newly manufactured, and may have a longer warranty period that the repaired RK units. And, schedules for avionics development are notoriously optimistic; not sure Smith can wait a year or more to get his 109 flying again.
This approach is much different in a technical sense than the Garmin panel pictured in another post in that these displays can be designed from the outset to be plug compatible (and possibly mechanically compatible) with the displays they replace, where as with the Garmin setup, there is much work to be done to interface the Garmin equipment with existing systems/equipment, some of which would almost certainly require Garmin's participation for software modification and certification. Posts here indicate that Astronautics already makes displays for another version of the AW109, so should be well down the learning curve.