My view is that Bangladesh should go for the J-35 and bypass the J10CE, Mig29/Su-35s/JF17 conversations entirely since BAF will be a small airforce anyway ( 100 jet units) and it will still have an advantage of 4.5 gen aircraft.
To get the "full" value of a Stealth fighter, you of course need a very sophisticated IADS, network links/radars and command control centres to provide targetting information to a stealth fighter etc. If you dont have this, then yes a 5th gen stealth will operate more as a 4.75 gen plane as the moment you have to switch on your radar to search for targets, you lose the advantage some of the advantage stealth. However, even with that reduction, you still have the natural advantage of stealth for CAP missions and strike missionsa t a level above 4.5 gen aircraft.
Bangladesh can work on the IADS/Radars/EW/Sensor network upgrades in parallel, they dont need to be there from day one. Bangladesh can work with Pakistan and Turkey on that side of things of course. You just accept that you are not operating a 5th gen plane at its "full" capabilities, but the military value that J-35 will bring to the table by value of its stealth, will be more than a J10CE ..