They won't match anything, things will remain as hopeless as now if you are seriously considering India as your enemy. There is no need to match your Frigates with any type of ours, is it a hockey match that your 6 Frigates will be pitched against our 6 Frigates? The combined force of even 10% of India's army, navy, air force would be too much for BD to handle. Indian Navy's air wing itself is many times stronger than BD's entire air force. You may not have noticed it, but India is a big country with considerable military strength.
You are a silly person aren't you?
Even with the current plans, BD airforce will have 8 upgraded Mig-29s and 12 SU-30SMEs. Assume that the Mig-29s are the equal of the Mi-29K but the SU-30SMEs will be way better.
BAF by 2030 will consist of 160 J-10B/C, SU-30SME and J-31. This force will be enough to at least match whatever India has in the NE(assuming that India still has control of that area by then lol).
Now if you want to carry on, please reply intelligently if you are able to.