As others have mentioned credit cards. Multiple. From my life experience- if you throw enough money at a problem, it usually goes away.
Probably won’t work in a mayday situation though, so plan for those along with $$.
may be consult another AP/IA? I can give you contact here, he is super knowledgeable on PIpers, used to run Piper service center, very thorough and super expensive :(
I believe for certificated install the internal GPS is disabled in configuration and to keep in enabled, you need that external antenna Jesse mentioned. I didnt think Garmin ever claimed that the magnetometer will be powered by the backup battery
I am not rated, so take my research with some grain of salt. I have also read you can log the approach if you were in IMC at IAF. someone please correct me if i am wrong
In some countries, its illegal to call or text after working hours. but again the beauty of text is, i dont care about it until i want to read it (not a CFI)