okjoe, I see your dilema. I work for a small test lab doing IC qualification & screening for space & defense industries, many of them obsoleted. I design test adapters and write test software for opamps, ADC, DAC, modulators, demodulators, RF & microwave mixers, amplifiers, VCO and many other linear & analog ICs, not to mention digitals & FPGAs. So, in my line of work, I see your lists are very typical. But I am an outlier, not the norm in this industry for the reason below.
As far as I know of, this is an industry is heading to extinction due to complexity and expertise spanned across many disciplines, meaning high overhead in acquiring expertise (many engineers) with low payback due to very low volume procurement. How many engineers a company has to hire to have enoug expertise in all fields (look at your ICs list) to do a small volume business? Many of them would prefer to work for a big company rather than to work for a small company. And even a big company couldn't afford to do such small business while incurring so much overheads, so they also have to look for outside test labs to do the jobs for them. Due to the vast knowledge required across many disciplines, it's very hard to do in house and majority of test labs couldn't even to test certain parts for you if they are honest in what they're doing.
BTW, equipments are not the real issue here because you can buy cheap useable & dated test equipments to do the job but knowledges and price for using the test equipments & testing the parts are a very BIG issue.