You don't know the law, you don't know how to handle difficult tenants, and you aren't local to work on it.This is what Ohio law says: “The tenant shall not unreasonably withhold consent for the landlord to enter into the dwelling unit in order to inspect the premises, make ordinary, necessary, or agreed repairs, decorations, alterations, or improvements, deliver parcels that are too large for the tenant’s mail facilities, supply necessary or agreed services, or exhibit the dwelling unit to prospective or actual purchasers, mortgagees, tenants, workmen, or contractors.”I would give the tenant a short, direct warning that they have 72 hours to coordinate with the vendor and set a schedule for repairs.

And is there any angle I'm not considering that would make this an unreasonable idea to pursue?

I do t what to argue the merits of the importance of title searching for title insurance I get it you love them you want to marry them they saved you money unhappy for you I have my opinion you have yours I'm just saying would you take a step back and you look at the amount of BS that they throw in there with what they're doing and the fact that they do forget who works for who it's crazy that being said I'm just wondering how long this is going to go on for every time the house sells and if you do have some of that doesn't want to sign off as is their right not to want to give off all the information especially in the climate of fraud that you talked about is there a solutionNo where in your screed did you give an explanation for why you didn't get a title policy when you bought the property from your friend, all you did was complain that the title company is being unreasonable and uncaring by refusing to help you clear up a problem of your own making. 

it might help to be able to point to your real estate agent as the unreasonable person who won't let close without resolving the issue.

In my area it is common for landlords to pay for heat which promotes a lot of abuse with the system in that tenants keep the heat at unreasonably high temperatures and often open the windows in the dead of winter when it can be -20 out.

I don't think that's an unreasonable request after two days. 

Not unreasonable to ask them to cut it down IMO.

It does not have to be adversarial, but people can be unreasonable about their family.

The worst thing you can do is be seen as an unreasonable and irritating component.

The only unreasonable thing you did here was roll over for this tenant.