Could you scratch the DR itch with a pair of rifle tube inserts ala Frankonia in Germany? This should keep you with things salible at a reasonable portion of your cost. Then, have a look at Chapuis DRs and start a warchest. Time will pass quicker than you imagine, a dedicated warchest will build faster than you imagine, and you will have a chance to figure out exactly where that 'ole itch is anyway.

If you can't keep focus long enough to build a warchest, you may not want it as bad as you think; been there, done that, and got several "tee shirts" to prove it. Got no objections to using a BSS (or similar) for a DR platform. However, be very sure that the end result will really scratch what is itching you.