Very interesting development bro! When it comes to the Bangladeshi land forces you guys could need some modern IFVs, as well as Altay tanks. The MLRS file is closed but needs a huge quantity of artillery. With the introduction of Hisar o+, and later the SIPER Bangladesh would have closed the file of the equipment for its land forces. It would definitely be the most modern army in the region in terms of quality. Seems like Bangladesh is taking a similar route as Morocco when it comes to filling its gaps, but has a long-term plan for a domestic defense industry.
When it comes to IFV/AFV we probably gonna need around 900-1000 of them.
Those will be wheeled instead of tracked. For example, BMC's Altug or FNSS pars iii equipped with Aselsan's 35mm Korhan turret would be cost effective but nevertheless capable platform. This process to replace all of our BTR-80 and old Chinese/soviet vehicles will take a decade at least. Probably starting at late 2020s and ending at late 2030s.
About MLRS I think we need one more regiment to deploy at our north west region. The same is true with Hisar O+, we are probably buying 1x regiment initially but will need 1x more.
And about the quantity of Artillery you are dead right. Both when it comes to the numbers of platform and number of shells. ( that is why I think that domestic production line would help)
Morocco has lots of M109s, that is a big plus point for you.