[Heathkit] My Lonely SB-620

[R. Blackman]

Hello to group.
I have a nice SB-620 that I resurrected from the dead from a junkfest many 
years ago.
I have used it over the years with my Yaesu FT-101 (sorry folks) that 
actually has a RCA
output jack for the IF of 3108 KHz.
I was able to tune down the SB-620 from the original Heathkit IF and it has 
worked happily for years.
I am considering trying to use it with my Kenwood 570 or Icom 706  (again 
apologies)
that have IF's of 8.83 or 9.01 KHz. Having  followed this list over the 
years, I realize it is almost impossible to locate the proper  coils for the 
conversion.
Does it make sense to build a small oscillator at the appropriate 
differential frequency, then mix the IF and oscillator so that the sum / 
difference would be 3180 ? I could even make a small narrow filter and then 
inject the 3180 into the SB-620.  Am I making this too difficult?
Yea or nay would be interesting.
Richard  VA3NDO