Did I read correctly that an option to recruit HarvestP straight up instead of having to get him pregnant or save him during a siege was being added or no? Something in regards to not having a bad reaction to finding out he's male?
HarvestP 'route' was the most convoluted out of all princesses, since it has even more requirement than GhostP or any other routes. You need to get HumanP to 4-5 hearts to get the Paired Red Rings, then reach at least 2 hearts with HarvestP first, then accept the request to search for the missing bell. Search for 'clues' by sneaking in at night, follow said clue, and at some time on the questline you'll get a confrontation scene where the secret was out. You need to choose the correct option (which is the 'don't freak out') to continue the route. At this point you have two choices: Let ScarecrowP takeover, enter the Turtle Shell on Lower Realm to keep ScarecrowP (as she counts as progeny) then redo the quest, kill the Pumpking and resume the rest of the quest or simply proceeding with the quest. You only need to get the bell and use it on HarvestP, then use the usual portal panties + Shorty Drink trick to get her pregnant, then recruit her; returning the bell is simply not advisable because you can use the bell to breed stronger progenies.
How to get into monastery
You'll need a flying progeny or a Cuckoo Wings, the first is far easier to get. There's a lot of dragon encounters that can give you winged dragon progenies, the easiest, guaranteed one being in the cliffs past the Mouse Town. The others are: balconies on HumanP castle, balconies on DesertP castle, balconies on top of Wyvern Princess castle on ice realm, and so on and so forth; just remember to save before triggering the encounter so you can reset if you didn't get the winged progenies. After than you'll need to reach the Upper Realm using the elevator near HarvestP town-you can sneak from sewers (needs key you can buy from the goblin) if you have too high of lust score. Then simply glide to down-right direction. To get the items inside the monastery however, you'll need some sneaking skills...