Again, manpower wasn't the issue. Equipment was. While it isn't emphatically said, the fact that the Aerospace portion of the Touman was kept attached to the Naval Reserve certainly suggests the Clan had limited Aerospace resources and they were probably either the weakest Clan Aerospace wise or close to it. Landing a supply of Aerospace Fighters would help but it's not going to overcome a top tier Clan.
Also again, pick a firm starting point and that'll give us a better idea where to start from.
As for PWS, there's really no reason given the conditions of the Homeworlds that Clans couldn't develop technologies on their own based on needs and wants - afterall a PWS is really just a trumped up assault dropship. The Clans DO have the technology. Perhaps, after the Smoke Jaguars have been Annihilated and the Great Refusal certain Clans realize hey, the Spheroids got one of us, maybe they'll go after the rest of us and plan accordingly. Given the bottlenecks involved in building Warships, maybe they'll look to PWS to fill the gap. What is less likely is parallel development of subCapital class weaponry. So Clan PWS if they take form, will probably be capital missile carriers unless they become entangled in the Inner Sphere/Jihad sphere. Doesn't mean it couldn't happen but if you want to go with subcaps, you'll probably want to explain it in a sensible fashion.
One advantage a PWS does bring, is that it allows you to tie up less actual Warriors than you'd think since most of the crew is in not Warrior Caste. Not really saying that it outweighs the disadvantages (limited availability for starters) but worth mentioning none the less.