That is not a plan investment, but rather you borrowing from your plan to put capital in your pocket for some purpose.The Rollover as Business Startup is an entirely different solution, designed to allow for the capitalization of a business in which you have direct involvement using existing retirement funds. 

Of course, this may attract attention you don't want but it will make the casual person think twice about entering to steal something.If you do find something, I'd be curious what your solution is.I've tinkered with a phone type of solution where you get an APP and then use the phone's camera. 

I just want a solution that is as hands off as possible and can generate $4K a month in rental profit.I’ve been looking at properties in the UK, but they either tend to be quite expensive or generate low rents.

your job isn't to educate or provide & explain the solution on the first call. 

Keyscan, DMP, Alarm.com, Honeywell, Brivo, and others all have commercial door access system based on keyfob solutions. 

I'm in process of building a solution to help owners find property managers.

@Delicia M.Here is another solution.

And I Already replaced all the old hardware with modern brushed nickel when I bought the place 16 years ago.

@Thomas Hallowes, A partnership like @Derek Carroll mentioned might be an attractive solution. 

I wont forget how amazed one of the agents who was showing me around Atlanta was when I introduced him to Waze a few years ago, which forecast  a stopped car around the bend - and sure enough there it was :)I land up needing to call my US bank on a landline more often than I ever need to call my Iocal bank - (in fact come to think of it I never call my local bank) The solution is to find a cell package that includes foreign calls in the base price- and then you don't think twice when you need to call or for how long.