There are several companies that offer 10 day IFR training class. They come to you, bring a simulator that you train on, you arrange the plane for actual flying. 10 days in a combination of classroom and in flight training. I don't know the costs, you can google "10 day ifr rating" and make a few calls.
I did mine more traditionally I suppose - self study to make sure I could answer any IFR knowledge exam question (did my PPL the same way) - then inflight training with an instructor in my own plane. It really let us get out of the New England area for summer trips. VFR, we'd get stymied trying to get past the Berkshire mountains in the summer.
Now it just becomes a matter of staying proficient, and staying out of icing conditions during cooler months.
These guys offer to do it for under $5K
But you have to have your knowledge exam out of the way first, with some real world flying experience under your belt:
Instrument Rating Course (10 Days)
Note: If additional time is required to bring you up to the FAA 40 hour instrument experience or 50 hour PIC cross country minimums, it can be incorporated into your IFR training at a rate of $150.00 per hour for dual instruction in the PA-28-180.
Aircraft rental for the checkride is 105.00 per hour. Your instructor will accompany you to your checkride at no additional charge.
The examiners charge $500.00 for the checkride and you can expect to pay the examiner directly on checkride day.
A courtesy car may be provided free of charge for local transportation.
If you need transportation from either MBS or APN, pickup can be arranged for a $300.00 fee round trip (fee includes pick up and drop off to the airport).
Hotel rooms are available for a very affordable rate of $35.00 per night. (subject to seasonal restrictions)
The cost for our 10 day IFR course is $4995.00 and includes:
25 hours of dual instruction in our Garmin 430 WAAS equipped PA-28.
Unlimited dual instruction in our Elite PI-135 BATD, (10 hours are loggable).
Unlimited ground instruction including pre and post flight briefings and oral prep.
Instrument written exam completed.
46 hours of PIC cross country of at least 50 nm.
10 hours of simulated (hood) or actual instrument experience. This can include the instrument training you received as a student pilot while working on your private pilot’s certificate.
The FAA written test must be completed prior to arrival for our accelerated courses.
So yeah, it's not cheap, but it will make you a better, safer pilot.