I do a lot of field macro photography with K1ii, K3ii and K3iii.
I use a RF-50 macro-lite (pc sync) + Af360FGZII, and macro flash diffuser. Since K30 doesn't have a pc sync port, you can't use RF 50 ring flash + speedlite combination. For tilted hotshoe adapter, you could try Hama Universal flash adapter. It's hard to find and the quality is bad. The adapter only lasted about 6 months...and I have two.
I highly recommend to get a good macro diffuser. With a good macro diffuser + speedlite, you don't really need a tilted hotshoe adapter.
Pentax AF360FGZII speedlite is great, and I also have a Promatic FTD 4500AF hot shoe bounce zoom flash with PTTL. It's an old flash but it's very powerful...if you don't want to spend a lot of money to buy Pentax AF360FGZII speedlite, Promatic FTD 4500AF is only $20 on ebay.
I have both AK diffuser and Popeshield macro diffuser, both work great (without tilting the speedlite for more light), but I like popeshield with roof, and you could still keep PTTL with a roof. You can watch this video on how to use it.
Good luck!
Here is a picture of Walnut sphinx moth (Amorpha juglandis) that I found in my backyard. I used K3iii, pentax 100mm Macro WR +Pentax AF360FGZII speedlite + Popeshield macro diffuser
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