I will start with your part about aircraft in Myanmar service...
MiG-29 Russia multirole SE/SM/UB -31
but ten
B variants used for training
Su-30SME -6 on order
Attack
A-5 -21
F-7M -21 licensed built
MiG-21
F-6- 1
JF-17 Thunder China /
Pakistan multirole 6+10 on order
Ok, so that is 21 MiG-29s, 6 Su-30SMEs, and 16 JF-17s which adds up to 43 fighters with 4+ generation capabilities. The fighters will be spread out throughout MM so I don't think a majority of them will be a threat early in the war considering only 1 base can reach BD and that is in Sittwe. I expect at most 20 4+ fighters in Sittwe that are within striking distance of BD, and other fighters too far to make a impact until a few weeks.
36 Gripen-E is a good idea for BD right now I agree and I agree that price would probably be 5 to 6 billion USD. Those fighters could also be used against India for at least a few months before sanctions take effect depending on spare parts, and weapons in BAF service. Meteor would be a must have as well as cruise missiles, and PGMs. I also agree that GlobalEye could be bought in 1-2 units for a billion USD or so.
I agree with your J-10 statement in full... 144 fighters or so would put BD in top 10 air force or so. I do think a regional alliance with Pakistan and China should be made with the sourness with Pakistan forgotten about.