Not sure what's your point here, in respect to which league players will choose? PCB declined to tour BD, because they can't host BD in UAE for financial reason, while BD won't tour PAK for security concerns - though, PAK is hosting other teams in UAE, while apart from ZIM, no other team visited PAK even for a T20 in last 8 years - who is fooling who, you can have a better idea, if you read all the posts in PP itself regarding this issue - ironically, most of the posts are made by PAK posters as well.
Regarding blocking BD players from PSL - at least I can tell you that Hasina Govt. would have tried that - at least for her, there is more than enough reasons. But, Bangladesh is not a failed state, neither a banana republic, that someone can stop professionals to earn legal money in their profession from vaunted ego - I hope you have got the clue how a proper system runs professionally in my salty response. BCB or BD cricketers are not someone's inherited property.
I explained it several times & once more for the last time - BD as a national team, can't tour PAK right now even if Jamat E Islam is in power with 2/3rd majority; because there is a functional constitution still working. Last time BCB agreed to send a team & there was a selection committee meeting as well - probable players were unofficially asked to prepare for the camp also, & I am telling you this in writing. Problem is, considering PAK's security situation, a gentleman (a Supreme Court lawyer, a bitter anti Pakistani, but doesn't matter again - Bangladesh is not a Banana republic), filed a law suit to justify BCB's decision to send a team risking players.
There was a proper legal trial, because again - Bangladesh is not a failed state, run at a gun point, where BCB couldn't convince Public Prosecutor regarding players safety in PAK - they brought people from foreign service, from NGOs, from Military security experts, from ICC office & from FICA (?) or some agency that looks after players security in the witness box. After proper hearing, BCB lost the case & it takes one person to file such a law suit - BCB will have to go through the whole cycle once more - to prove why they don't think that PAK isn't unsafe for BD team? As long as PAK's situation/status as a high risk country doesn't change - make Nawaz Sharif BD's Prime Minister, BD team under National color can't tour PAK - as long as some General doesn't send a note to Supreme Court at gun point - I hope, you have got this clue as well.
Coming to individual players - the situation is different. For a clue, I can request you to find out all the doubles partners of Aisam-ul-Haq Qureshi & their nationality - particularly for Wimbledon. BCB can't decline any player NOC for a professional tournament, as long as it's ICC affiliated & not listed as corrupt - they'll lose the legal battle with compensation payment every time - because again, there is a proper judicial system in Bangladesh, it's not a failed statw. If any player goes to play on personal terms at Mogadishu or South Wazirstan or Al Raqqa, only BCB can do is send a precaution notice as long as the tournament isn't black listed by ICC - because, BCB isn't Papon's father's property. If any one files a law suit - this time it's the player's responsibility to clear his name, not BCB's & they player will get compensation on defame charge from anyone that tries to block his participation.
Hope it helps - don't mix things that you don't understand, or not willing to understand. I hear people asking questions if BPL pays the players or not - because these are fool & tool. Most of PAK national players send their name for BPL draft every year - what this novices are telling is PAK national players are beggars - taking their chances to earn some money, risking non payment for their effort ... like beggars do at street - "Allah ke waste kuch day do bhai". What ever is thrown at them is Shukar Alhamdulillah, but if someone doesn't give anything, they don't curse that person - starts for their next attempt, like PAK players will send their name for draft again next year.
Only fools spoil the good mood of friends