IMHO, they should upgrade the L39's (while sending them back to Czech Republic in rolling order in batches of three/four) because the latest example of L39 variant is L39 NG (new generation), which boasts a US-made Williams FJ-44 engine (better MTBF/MTBO and much improved reliability due to this being used in most western business jets), lighter fuselage, Italian FIAR Grifo radar, better cockpit with Boeing supplied avionics, wet wings which delete the tip-tanks, and (get this) five hard-points instead of two to support missiles such as sidewinder types. Modifications have been made to support much more load and g-force compared to L39 version that BAF uses.
Thai AF which has similar L39's like BAF, are evaluating this new trainer.
Cost is Euro 12 Million per example. Cost could be defrayed by returning the existing L39 airframes and engines (Ivchenko AI-25).
So these new L39 NG aircraft could easily be used as light attack platforms by BAF. In fact L39 variants L59/L159 have been used by IRAQI AF against ISIS. Which is really not that glowing an endorsement for a fighter, but given what it is (a trainer) is saying a lot. Tunisian AF has also used their L-59's against Al-Qaida Maghreb insurgents. Perfect Anti-insurgency platform.
Note enlarged improved e-z-crack canopy a la BAE HAWK latest versions, absence of tip tanks and modified nose, a la Yak 130 & Macchi 346.
Also note new glass cockpit...