I've done Crypto, stocks, businesses, ecommerce, trading bots, ponzi schemes etc. 

I don't think so if you're ok with the currency and political risks.

@Sean WalcottSyndication is just a fancy term to represent the pooling of money together to make some type of investment.The investment will depend on the prospectus and the investment strategy of the sponsor.A syndication can invest in Stocks, Pre-IPO companies, crypto or real estate.Since you are on a real estate site, I assume a real estate syndication.A real estate syndication can be very broad as there are many strategies - SFH, Multi, Land, Commercial, Storage, etc.Speak to your CPA how an investment in a syndication will impact your taxes.Normally, you will be a limited partner / non-managing member in a syndication which limits your capability of utilizing losses to offset your W-2 income since you won't have active participation.

Like Living in South Africa but earning in dollars, currency conversion rich. 

(Not sure, but it seems like crypto currency gains might qualify too.)  2.

I have a govt pension coming at age 50 but other than that I don't buy stocks, bonds, crypto etc. 

My wife enjoys decorating the house for the seasons.She listens to me talk about commercial real estate investments and development and is interested but likes doing her own stuff.There are teams out there that both love real estate and other partners who find joy and currency in many other different things.I celebrate the differences as it is another unique angle in life to experience and enjoy.The big question is if your girlfriend is okay with having 3 tenants living next door to her?

I use Remitly for free to pay her in USD that gets converted to her currency. 

Checkbook LLCs do have there place in certain investments such as crypto currency, tax sales, overseas purchases and storage of precious metals, etc. 

I would not invest it in anything crazy (like crypto) - preservation of capital would be my #1 priority.