VT5 and Kaplan are in the same lightweight class - 35 tons.
Bangladesh already fulfilled light weight tank requirement with VT5 (deliveries will commence later this year, or maybe next year due to covid19 delay), chances of our army getting Kaplan are a lot less now (unless there are serious issues with VT5).
For Medium weight tank requirement (which will be the elite tank for elite army units), I don't see us moving beyond this weight class, except (like you said - maybe getting highly-mobile wheeled tank destroyers with larger caliber guns). So in this 45-49 ton middle-weight class Type 10 (with ToT) can be a very good (yet expensive) choice at 45 tons. Japan's Type 90 is predecessor of Type 10 and will soon be put into reserve units (if not already). But Japan has stringent export bans.
Turkey wanted to use the Type 10 as a power package template for Altay before they went to Hyundai Rotem for technical input on the design and engine. Altay is way too heavy in my opinion to be called a middle-weight tank (65 tons) and weighs the same as Arjun MK.II. most bridges in Bangladesh, (if they still exist at time of conflict) cannot support these heavyweight tanks.
Indian Army T-90S
Bhishma tanks weigh a lot less (45 tons - as they are modernized T-72's), so that will be our goal to counter as tank adversary (if at all) for other than North Bengal area where rivers are not big obstacles. But like
@Michael Corleone bhai said, any adversary will need to think twice before launching an armored invasion in Bangladesh especially in the wet season. There is a reason Indian Army waited until December to come into Bangladesh in 1971 (Manekshaw knew), you can't fight a traditional skirmish in our local conditions. We know our local conditions - our adversary will need time to figure them out.
Tanks are a selective tool for selective situations (hidden ambush in our scenario), they are not usable in our country in an open terrain or urban middle-east type scenario because of TOW missile and RPG vulnerabilities. There is only so much you can do - to defend tanks, using ERA and dumb Bar armor. if Myanmarese or Indian armored brigades invade our territory, they will have considerable losses in spite of Kontakt ERA armor.