I am wondering a little about what you are doing... I can understand that the 1740 may be a little too large and unwieldy for whatever you're into but I am skeptical about getting a BX to do the job. Relatively few people have a grapple on a BX. Landpride makes some for the BX but these are NOT using skid-steer-compatible SSA quick connects.
You may well know a LOT about the
BX23S and have solid reasons for going that way. You may already have committed to getting one.
I've owned (or bought for family) 4 BX machines and to me they are a little light in the loafers for grapple work of any substantial kind.
Can you describe a bit more about your intended grapple work and limited space, etc. ?
Overstepping my bounds (and certainly with little/no knowledge of your situation) I suggest:
1) Find a subcompact tractor just a tad larger than the
BX23S that has 2 things:
A common and often found remote hydraulic set / third function. And a SSA quick connect for the grapple and bucket and whatever else you put up there.
2) The
BX23S connections for buckets and grapples are proprietary one-brand stuff for Kubota unless you found an exception. While I love Kubota I would not want that circumstance.
3) There are a lot of good little machines (several brands including Kubota) that are just a little bigger,
typically available with the SSA loader interface, commonly used with third function goodies on the FEL, etc. To me you are better off that way.
Your MF1740 being a 40 horse and weighing 3400 to 3800 lbs and 71" wheelbase versus a
BX23S with a 55" wheelbase, 1600 lbs... just wondering if the 1600lb guy will do what you want done with a grapple. Lift capacity is around 400 to 500 lbs with the BX loader. Not a heck of a lot. OBTW, I use a grapple on a larger MF tractor and find it so useful for so many things ... brush and debris and logs and etc.... you already have a grapple for the MF1740?
End of my wanderings...good luck with your venture.